diff --git a/asset/README.rst b/asset/README.rst
index efb1d487ee29..60dae9f12f6c 100644
--- a/asset/README.rst
+++ b/asset/README.rst
@@ -8,7 +8,7 @@ Python Client for Cloud Asset API (`Alpha`_)
 
 .. _Alpha: https://github.com/GoogleCloudPlatform/google-cloud-python/blob/master/README.rst
 .. _Cloud Asset API: https://cloud.google.com/cloudasset
-.. _Client Library Documentation: https://googlecloudplatform.github.io/google-cloud-python/latest/asset/index.html
+.. _Client Library Documentation: https://googlecloudplatform.github.io/google-cloud-python/stable/cloudasset/usage.html
 .. _Product Documentation:  https://cloud.google.com/cloudasset
 
 Quick Start
@@ -24,7 +24,7 @@ In order to use this library, you first need to go through the following steps:
 .. _Select or create a Cloud Platform project.: https://console.cloud.google.com/project
 .. _Enable billing for your project.: https://cloud.google.com/billing/docs/how-to/modify-project#enable_billing_for_a_project
 .. _Enable the Cloud Asset API.:  https://cloud.google.com/cloudasset
-.. _Setup Authentication.: https://googlecloudplatform.github.io/google-cloud-python/latest/core/auth.html
+.. _Setup Authentication.: https://googlecloudplatform.github.io/google-cloud-python/stable/core/auth.html
 
 Installation
 ~~~~~~~~~~~~
@@ -72,4 +72,4 @@ Next Steps
    APIs that we cover.
 
 .. _Cloud Asset API Product documentation:  https://cloud.google.com/cloudasset
-.. _repository’s main README: https://github.com/GoogleCloudPlatform/google-cloud-python/blob/master/README.rst
+.. _repository’s main README: https://github.com/GoogleCloudPlatform/google-cloud-python/blob/master/README.rst
\ No newline at end of file
diff --git a/asset/docs/index.rst b/asset/docs/index.rst
index 56aaa3359af8..2310dd2fa372 100644
--- a/asset/docs/index.rst
+++ b/asset/docs/index.rst
@@ -1,4 +1,78 @@
-.. include:: /../asset/README.rst
+Python Client for Cloud Asset API (`Alpha`_)
+============================================
+
+`Cloud Asset API`_: The cloud asset API manages the history and inventory of cloud resources.
+
+- `Client Library Documentation`_
+- `Product Documentation`_
+
+.. _Alpha: https://github.com/GoogleCloudPlatform/google-cloud-python/blob/master/README.rst
+.. _Cloud Asset API: https://cloud.google.com/cloudasset
+.. _Client Library Documentation: https://googlecloudplatform.github.io/google-cloud-python/stable/cloudasset/usage.html
+.. _Product Documentation:  https://cloud.google.com/cloudasset
+
+Quick Start
+-----------
+
+In order to use this library, you first need to go through the following steps:
+
+1. `Select or create a Cloud Platform project.`_
+2. `Enable billing for your project.`_
+3. `Enable the Cloud Asset API.`_
+4. `Setup Authentication.`_
+
+.. _Select or create a Cloud Platform project.: https://console.cloud.google.com/project
+.. _Enable billing for your project.: https://cloud.google.com/billing/docs/how-to/modify-project#enable_billing_for_a_project
+.. _Enable the Cloud Asset API.:  https://cloud.google.com/cloudasset
+.. _Setup Authentication.: https://googlecloudplatform.github.io/google-cloud-python/stable/core/auth.html
+
+Installation
+~~~~~~~~~~~~
+
+Install this library in a `virtualenv`_ using pip. `virtualenv`_ is a tool to
+create isolated Python environments. The basic problem it addresses is one of
+dependencies and versions, and indirectly permissions.
+
+With `virtualenv`_, it's possible to install this library without needing system
+install permissions, and without clashing with the installed system
+dependencies.
+
+.. _`virtualenv`: https://virtualenv.pypa.io/en/latest/
+
+
+Mac/Linux
+^^^^^^^^^
+
+.. code-block:: console
+
+    pip install virtualenv
+    virtualenv <your-env>
+    source <your-env>/bin/activate
+    <your-env>/bin/pip install google-cloud-cloudasset
+
+
+Windows
+^^^^^^^
+
+.. code-block:: console
+
+    pip install virtualenv
+    virtualenv <your-env>
+    <your-env>\Scripts\activate
+    <your-env>\Scripts\pip.exe install google-cloud-cloudasset
+
+Next Steps
+~~~~~~~~~~
+
+-  Read the `Client Library Documentation`_ for Cloud Asset API
+   API to see other available methods on the client.
+-  Read the `Cloud Asset API Product documentation`_ to learn
+   more about the product and see How-to Guides.
+-  View this `repository’s main README`_ to see the full list of Cloud
+   APIs that we cover.
+
+.. _Cloud Asset API Product documentation:  https://cloud.google.com/cloudasset
+.. _repository’s main README: https://github.com/GoogleCloudPlatform/google-cloud-python/blob/master/README.rst
 
 Api Reference
 -------------
@@ -6,4 +80,4 @@ Api Reference
     :maxdepth: 2
 
     gapic/v1beta1/api
-    gapic/v1beta1/types
+    gapic/v1beta1/types
\ No newline at end of file
diff --git a/asset/google/__init__.py b/asset/google/__init__.py
index 855a707300e1..f65701dd143f 100644
--- a/asset/google/__init__.py
+++ b/asset/google/__init__.py
@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+#
 # Copyright 2018 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -17,4 +19,4 @@
     pkg_resources.declare_namespace(__name__)
 except ImportError:
     import pkgutil
-    __path__ = pkgutil.extend_path(__path__, __name__)
\ No newline at end of file
+    __path__ = pkgutil.extend_path(__path__, __name__)
diff --git a/asset/google/cloud/__init__.py b/asset/google/cloud/__init__.py
index 855a707300e1..f65701dd143f 100644
--- a/asset/google/cloud/__init__.py
+++ b/asset/google/cloud/__init__.py
@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+#
 # Copyright 2018 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -17,4 +19,4 @@
     pkg_resources.declare_namespace(__name__)
 except ImportError:
     import pkgutil
-    __path__ = pkgutil.extend_path(__path__, __name__)
\ No newline at end of file
+    __path__ = pkgutil.extend_path(__path__, __name__)
diff --git a/asset/google/cloud/asset.py b/asset/google/cloud/asset.py
index 0262faf06174..0aa16ee24654 100644
--- a/asset/google/cloud/asset.py
+++ b/asset/google/cloud/asset.py
@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+#
 # Copyright 2018 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/asset/google/cloud/asset_v1beta1/__init__.py b/asset/google/cloud/asset_v1beta1/__init__.py
index 758f682328b9..6d4f99788c5b 100644
--- a/asset/google/cloud/asset_v1beta1/__init__.py
+++ b/asset/google/cloud/asset_v1beta1/__init__.py
@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+#
 # Copyright 2018 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/asset/google/cloud/asset_v1beta1/gapic/asset_service_client.py b/asset/google/cloud/asset_v1beta1/gapic/asset_service_client.py
index 3cff1e824c4d..bffc422bae36 100644
--- a/asset/google/cloud/asset_v1beta1/gapic/asset_service_client.py
+++ b/asset/google/cloud/asset_v1beta1/gapic/asset_service_client.py
@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+#
 # Copyright 2018 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -168,34 +170,30 @@ def __init__(self,
     # Service calls
     def export_assets(self,
                       parent,
-                      content_types,
                       output_config,
                       read_time=None,
                       asset_types=None,
+                      content_type=None,
                       retry=google.api_core.gapic_v1.method.DEFAULT,
                       timeout=google.api_core.gapic_v1.method.DEFAULT,
                       metadata=None):
         """
         Exports assets with time and resource types to a given Google Cloud Storage
-        location. The output format is newline delimited JSON.
+        location. The output format is newline-delimited JSON.
         This API implements the ``google.longrunning.Operation`` API allowing users
         to keep track of the export.
 
         Example:
             >>> from google.cloud import asset_v1beta1
-            >>> from google.cloud.asset_v1beta1 import enums
             >>>
             >>> client = asset_v1beta1.AssetServiceClient()
             >>>
             >>> parent = client.project_path('[PROJECT]')
             >>>
-            >>> # TODO: Initialize ``content_types``:
-            >>> content_types = []
-            >>>
             >>> # TODO: Initialize ``output_config``:
             >>> output_config = {}
             >>>
-            >>> response = client.export_assets(parent, content_types, output_config)
+            >>> response = client.export_assets(parent, output_config)
             >>>
             >>> def callback(operation_future):
             ...     # Handle result.
@@ -207,23 +205,24 @@ def export_assets(self,
             >>> metadata = response.metadata()
 
         Args:
-            parent (str): Required. The relative name of the root asset. It can only be an
-                organization number (e.g. \"organizations/123\") or a project number
-                (e.g. \"projects/12345\").
-            content_types (list[~google.cloud.asset_v1beta1.types.ContentType]): A list of asset content types. If specified, only matching content will be
-                returned. Otherwise, no content but the asset name will be returned.
+            parent (str): Required. The relative name of the root asset. Can only be an organization
+                number (such as \"organizations/123\"), or a project id (such as
+                \"projects/my-project-id\") or a project number (such as \"projects/12345\").
             output_config (Union[dict, ~google.cloud.asset_v1beta1.types.OutputConfig]): Required. Output configuration indicating where the results will be output
                 to. All results will be in newline delimited JSON format.
                 If a dict is provided, it must be of the same form as the protobuf
                 message :class:`~google.cloud.asset_v1beta1.types.OutputConfig`
-            read_time (Union[dict, ~google.cloud.asset_v1beta1.types.Timestamp]): Timestamp to take an asset snapshot. This can only be current or past
-                time. If not specified, the current time will be used. Due to delays in
-                resource data collection and indexing, there is a volatile window during
-                which running the same query may get different results.
+            read_time (Union[dict, ~google.cloud.asset_v1beta1.types.Timestamp]): Timestamp to take an asset snapshot. This can only be set to a timestamp in
+                the past or of the current time. If not specified, the current time will be
+                used. Due to delays in resource data collection and indexing, there is a
+                volatile window during which running the same query may get different
+                results.
                 If a dict is provided, it must be of the same form as the protobuf
                 message :class:`~google.cloud.asset_v1beta1.types.Timestamp`
-            asset_types (list[str]): A list of asset types to take a snapshot for. Example:
+            asset_types (list[str]): A list of asset types of which to take a snapshot for. Example:
                 \"google.compute.disk\". If specified, only matching assets will be returned.
+            content_type (~google.cloud.asset_v1beta1.types.ContentType): Asset content type. If not specified, no content but the asset name will be
+                returned.
             retry (Optional[google.api_core.retry.Retry]):  A retry object used
                 to retry requests. If ``None`` is specified, requests will not
                 be retried.
@@ -249,17 +248,17 @@ def export_assets(self,
                 'export_assets'] = google.api_core.gapic_v1.method.wrap_method(
                     self.transport.export_assets,
                     default_retry=self._method_configs['ExportAssets'].retry,
-                    default_timeout=self._method_configs['ExportAssets']
-                    .timeout,
+                    default_timeout=self._method_configs['ExportAssets'].
+                    timeout,
                     client_info=self._client_info,
                 )
 
         request = asset_service_pb2.ExportAssetsRequest(
             parent=parent,
-            content_types=content_types,
             output_config=output_config,
             read_time=read_time,
             asset_types=asset_types,
+            content_type=content_type,
         )
         operation = self._inner_api_calls['export_assets'](
             request, retry=retry, timeout=timeout, metadata=metadata)
@@ -273,9 +272,9 @@ def export_assets(self,
     def batch_get_assets_history(
             self,
             parent,
-            asset_names,
             content_type,
             read_time_window,
+            asset_names=None,
             retry=google.api_core.gapic_v1.method.DEFAULT,
             timeout=google.api_core.gapic_v1.method.DEFAULT,
             metadata=None):
@@ -294,33 +293,31 @@ def batch_get_assets_history(
             >>>
             >>> parent = client.project_path('[PROJECT]')
             >>>
-            >>> # TODO: Initialize ``asset_names``:
-            >>> asset_names = []
-            >>>
             >>> # TODO: Initialize ``content_type``:
             >>> content_type = enums.ContentType.CONTENT_TYPE_UNSPECIFIED
             >>>
             >>> # TODO: Initialize ``read_time_window``:
             >>> read_time_window = {}
             >>>
-            >>> response = client.batch_get_assets_history(parent, asset_names, content_type, read_time_window)
+            >>> response = client.batch_get_assets_history(parent, content_type, read_time_window)
 
         Args:
             parent (str): Required. The relative name of the root asset. It can only be an
-                organization ID (e.g. \"organizations/123\") or a project ID
-                (e.g. \"projects/12345\").
+                organization number (such as \"organizations/123\"), or a project id (such as
+                \"projects/my-project-id\")\"or a project number (such as \"projects/12345\").
+            content_type (~google.cloud.asset_v1beta1.types.ContentType): Required. The content type.
+            read_time_window (Union[dict, ~google.cloud.asset_v1beta1.types.TimeWindow]): Required. The time window for the asset history. The start time is
+                required. The returned results contain all temporal assets whose time
+                window overlap with read_time_window.
+                If a dict is provided, it must be of the same form as the protobuf
+                message :class:`~google.cloud.asset_v1beta1.types.TimeWindow`
             asset_names (list[str]): A list of the full names of the assets. See:
                 https://cloud.google.com/apis/design/resource_names#full_resource_name
                 Example:
                 \"//compute.googleapis.com/projects/my_project_123/zones/zone1/instances/instance1\".
 
-                The request becomes a no-op if the asset name list is empty.
-            content_type (~google.cloud.asset_v1beta1.types.ContentType): Required. The content type.
-            read_time_window (Union[dict, ~google.cloud.asset_v1beta1.types.TimeWindow]): Required. The time window for the asset history. The returned results
-                contain all temporal assets whose time window overlap with
-                read_time_window.
-                If a dict is provided, it must be of the same form as the protobuf
-                message :class:`~google.cloud.asset_v1beta1.types.TimeWindow`
+                The request becomes a no-op if the asset name list is empty, and the max
+                size of the asset name list is 100 in one request.
             retry (Optional[google.api_core.retry.Retry]):  A retry object used
                 to retry requests. If ``None`` is specified, requests will not
                 be retried.
@@ -345,18 +342,18 @@ def batch_get_assets_history(
             self._inner_api_calls[
                 'batch_get_assets_history'] = google.api_core.gapic_v1.method.wrap_method(
                     self.transport.batch_get_assets_history,
-                    default_retry=self._method_configs['BatchGetAssetsHistory']
-                    .retry,
-                    default_timeout=self._method_configs[
-                        'BatchGetAssetsHistory'].timeout,
+                    default_retry=self.
+                    _method_configs['BatchGetAssetsHistory'].retry,
+                    default_timeout=self.
+                    _method_configs['BatchGetAssetsHistory'].timeout,
                     client_info=self._client_info,
                 )
 
         request = asset_service_pb2.BatchGetAssetsHistoryRequest(
             parent=parent,
-            asset_names=asset_names,
             content_type=content_type,
             read_time_window=read_time_window,
+            asset_names=asset_names,
         )
         return self._inner_api_calls['batch_get_assets_history'](
             request, retry=retry, timeout=timeout, metadata=metadata)
diff --git a/asset/google/cloud/asset_v1beta1/gapic/enums.py b/asset/google/cloud/asset_v1beta1/gapic/enums.py
index 3353d5431b8c..2b85581c630f 100644
--- a/asset/google/cloud/asset_v1beta1/gapic/enums.py
+++ b/asset/google/cloud/asset_v1beta1/gapic/enums.py
@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+#
 # Copyright 2018 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/asset/google/cloud/asset_v1beta1/gapic/transports/asset_service_grpc_transport.py b/asset/google/cloud/asset_v1beta1/gapic/transports/asset_service_grpc_transport.py
index 520b33dab451..7137364742b4 100644
--- a/asset/google/cloud/asset_v1beta1/gapic/transports/asset_service_grpc_transport.py
+++ b/asset/google/cloud/asset_v1beta1/gapic/transports/asset_service_grpc_transport.py
@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+#
 # Copyright 2018 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -102,7 +104,7 @@ def export_assets(self):
         """Return the gRPC stub for {$apiMethod.name}.
 
         Exports assets with time and resource types to a given Google Cloud Storage
-        location. The output format is newline delimited JSON.
+        location. The output format is newline-delimited JSON.
         This API implements the ``google.longrunning.Operation`` API allowing users
         to keep track of the export.
 
diff --git a/asset/google/cloud/asset_v1beta1/proto/asset_service_pb2.py b/asset/google/cloud/asset_v1beta1/proto/asset_service_pb2.py
index fe96ac772d1f..722422178293 100644
--- a/asset/google/cloud/asset_v1beta1/proto/asset_service_pb2.py
+++ b/asset/google/cloud/asset_v1beta1/proto/asset_service_pb2.py
@@ -24,7 +24,7 @@
   name='google/cloud/asset_v1beta1/proto/asset_service.proto',
   package='google.cloud.asset.v1beta1',
   syntax='proto3',
-  serialized_pb=_b('\n4google/cloud/asset_v1beta1/proto/asset_service.proto\x12\x1agoogle.cloud.asset.v1beta1\x1a\x1cgoogle/api/annotations.proto\x1a-google/cloud/asset_v1beta1/proto/assets.proto\x1a#google/longrunning/operations.proto\x1a\x1fgoogle/protobuf/timestamp.proto\"\xea\x01\n\x13\x45xportAssetsRequest\x12\x0e\n\x06parent\x18\x01 \x01(\t\x12-\n\tread_time\x18\x02 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x13\n\x0b\x61sset_types\x18\x03 \x03(\t\x12>\n\rcontent_types\x18\x04 \x03(\x0e\x32\'.google.cloud.asset.v1beta1.ContentType\x12?\n\routput_config\x18\x05 \x01(\x0b\x32(.google.cloud.asset.v1beta1.OutputConfig\"\x86\x01\n\x14\x45xportAssetsResponse\x12-\n\tread_time\x18\x01 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12?\n\routput_config\x18\x02 \x01(\x0b\x32(.google.cloud.asset.v1beta1.OutputConfig\"\xc4\x01\n\x1c\x42\x61tchGetAssetsHistoryRequest\x12\x0e\n\x06parent\x18\x01 \x01(\t\x12\x13\n\x0b\x61sset_names\x18\x02 \x03(\t\x12=\n\x0c\x63ontent_type\x18\x03 \x01(\x0e\x32\'.google.cloud.asset.v1beta1.ContentType\x12@\n\x10read_time_window\x18\x04 \x01(\x0b\x32&.google.cloud.asset.v1beta1.TimeWindow\"Z\n\x1d\x42\x61tchGetAssetsHistoryResponse\x12\x39\n\x06\x61ssets\x18\x01 \x03(\x0b\x32).google.cloud.asset.v1beta1.TemporalAsset\"d\n\x0cOutputConfig\x12\x45\n\x0fgcs_destination\x18\x01 \x01(\x0b\x32*.google.cloud.asset.v1beta1.GcsDestinationH\x00\x42\r\n\x0b\x64\x65stination\"\x1d\n\x0eGcsDestination\x12\x0b\n\x03uri\x18\x01 \x01(\t*I\n\x0b\x43ontentType\x12\x1c\n\x18\x43ONTENT_TYPE_UNSPECIFIED\x10\x00\x12\x0c\n\x08RESOURCE\x10\x01\x12\x0e\n\nIAM_POLICY\x10\x02\x32\xdf\x03\n\x0c\x41ssetService\x12\xc9\x01\n\x0c\x45xportAssets\x12/.google.cloud.asset.v1beta1.ExportAssetsRequest\x1a\x1d.google.longrunning.Operation\"i\x82\xd3\xe4\x93\x02\x63\")/v1beta1/{parent=projects/*}:exportAssets:\x01*Z3\"./v1beta1/{parent=organizations/*}:exportAssets:\x01*\x12\x82\x02\n\x15\x42\x61tchGetAssetsHistory\x12\x38.google.cloud.asset.v1beta1.BatchGetAssetsHistoryRequest\x1a\x39.google.cloud.asset.v1beta1.BatchGetAssetsHistoryResponse\"t\x82\xd3\xe4\x93\x02n\x12\x32/v1beta1/{parent=projects/*}:batchGetAssetsHistoryZ8\x12\x36/v1beta1/{parent=organizations/*}:batchGetAssetHistoryB\xb0\x01\n\x1e\x63om.google.cloud.asset.v1beta1B\x11\x41ssetServiceProtoP\x01Z?google.golang.org/genproto/googleapis/cloud/asset/v1beta1;asset\xaa\x02\x1aGoogle.Cloud.Asset.V1Beta1\xca\x02\x1aGoogle\\Cloud\\Asset\\V1beta1b\x06proto3')
+  serialized_pb=_b('\n4google/cloud/asset_v1beta1/proto/asset_service.proto\x12\x1agoogle.cloud.asset.v1beta1\x1a\x1cgoogle/api/annotations.proto\x1a-google/cloud/asset_v1beta1/proto/assets.proto\x1a#google/longrunning/operations.proto\x1a\x1fgoogle/protobuf/timestamp.proto\"\xe9\x01\n\x13\x45xportAssetsRequest\x12\x0e\n\x06parent\x18\x01 \x01(\t\x12-\n\tread_time\x18\x02 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12\x13\n\x0b\x61sset_types\x18\x03 \x03(\t\x12=\n\x0c\x63ontent_type\x18\x04 \x01(\x0e\x32\'.google.cloud.asset.v1beta1.ContentType\x12?\n\routput_config\x18\x05 \x01(\x0b\x32(.google.cloud.asset.v1beta1.OutputConfig\"\x86\x01\n\x14\x45xportAssetsResponse\x12-\n\tread_time\x18\x01 \x01(\x0b\x32\x1a.google.protobuf.Timestamp\x12?\n\routput_config\x18\x02 \x01(\x0b\x32(.google.cloud.asset.v1beta1.OutputConfig\"\xc4\x01\n\x1c\x42\x61tchGetAssetsHistoryRequest\x12\x0e\n\x06parent\x18\x01 \x01(\t\x12\x13\n\x0b\x61sset_names\x18\x02 \x03(\t\x12=\n\x0c\x63ontent_type\x18\x03 \x01(\x0e\x32\'.google.cloud.asset.v1beta1.ContentType\x12@\n\x10read_time_window\x18\x04 \x01(\x0b\x32&.google.cloud.asset.v1beta1.TimeWindow\"Z\n\x1d\x42\x61tchGetAssetsHistoryResponse\x12\x39\n\x06\x61ssets\x18\x01 \x03(\x0b\x32).google.cloud.asset.v1beta1.TemporalAsset\"d\n\x0cOutputConfig\x12\x45\n\x0fgcs_destination\x18\x01 \x01(\x0b\x32*.google.cloud.asset.v1beta1.GcsDestinationH\x00\x42\r\n\x0b\x64\x65stination\"\x1d\n\x0eGcsDestination\x12\x0b\n\x03uri\x18\x01 \x01(\t*I\n\x0b\x43ontentType\x12\x1c\n\x18\x43ONTENT_TYPE_UNSPECIFIED\x10\x00\x12\x0c\n\x08RESOURCE\x10\x01\x12\x0e\n\nIAM_POLICY\x10\x02\x32\xdf\x03\n\x0c\x41ssetService\x12\xc9\x01\n\x0c\x45xportAssets\x12/.google.cloud.asset.v1beta1.ExportAssetsRequest\x1a\x1d.google.longrunning.Operation\"i\x82\xd3\xe4\x93\x02\x63\")/v1beta1/{parent=projects/*}:exportAssets:\x01*Z3\"./v1beta1/{parent=organizations/*}:exportAssets:\x01*\x12\x82\x02\n\x15\x42\x61tchGetAssetsHistory\x12\x38.google.cloud.asset.v1beta1.BatchGetAssetsHistoryRequest\x1a\x39.google.cloud.asset.v1beta1.BatchGetAssetsHistoryResponse\"t\x82\xd3\xe4\x93\x02n\x12\x32/v1beta1/{parent=projects/*}:batchGetAssetsHistoryZ8\x12\x36/v1beta1/{parent=organizations/*}:batchGetAssetHistoryB\xb0\x01\n\x1e\x63om.google.cloud.asset.v1beta1B\x11\x41ssetServiceProtoP\x01Z?google.golang.org/genproto/googleapis/cloud/asset/v1beta1;asset\xaa\x02\x1aGoogle.Cloud.Asset.V1Beta1\xca\x02\x1aGoogle\\Cloud\\Asset\\V1beta1b\x06proto3')
   ,
   dependencies=[google_dot_api_dot_annotations__pb2.DESCRIPTOR,google_dot_cloud_dot_asset__v1beta1_dot_proto_dot_assets__pb2.DESCRIPTOR,google_dot_longrunning_dot_operations__pb2.DESCRIPTOR,google_dot_protobuf_dot_timestamp__pb2.DESCRIPTOR,])
 
@@ -49,8 +49,8 @@
   ],
   containing_type=None,
   options=None,
-  serialized_start=1029,
-  serialized_end=1102,
+  serialized_start=1028,
+  serialized_end=1101,
 )
 _sym_db.RegisterEnumDescriptor(_CONTENTTYPE)
 
@@ -90,9 +90,9 @@
       is_extension=False, extension_scope=None,
       options=None, file=DESCRIPTOR),
     _descriptor.FieldDescriptor(
-      name='content_types', full_name='google.cloud.asset.v1beta1.ExportAssetsRequest.content_types', index=3,
-      number=4, type=14, cpp_type=8, label=3,
-      has_default_value=False, default_value=[],
+      name='content_type', full_name='google.cloud.asset.v1beta1.ExportAssetsRequest.content_type', index=3,
+      number=4, type=14, cpp_type=8, label=1,
+      has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None, file=DESCRIPTOR),
@@ -116,7 +116,7 @@
   oneofs=[
   ],
   serialized_start=232,
-  serialized_end=466,
+  serialized_end=465,
 )
 
 
@@ -153,8 +153,8 @@
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=469,
-  serialized_end=603,
+  serialized_start=468,
+  serialized_end=602,
 )
 
 
@@ -205,8 +205,8 @@
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=606,
-  serialized_end=802,
+  serialized_start=605,
+  serialized_end=801,
 )
 
 
@@ -236,8 +236,8 @@
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=804,
-  serialized_end=894,
+  serialized_start=803,
+  serialized_end=893,
 )
 
 
@@ -270,8 +270,8 @@
       name='destination', full_name='google.cloud.asset.v1beta1.OutputConfig.destination',
       index=0, containing_type=None, fields=[]),
   ],
-  serialized_start=896,
-  serialized_end=996,
+  serialized_start=895,
+  serialized_end=995,
 )
 
 
@@ -301,12 +301,12 @@
   extension_ranges=[],
   oneofs=[
   ],
-  serialized_start=998,
-  serialized_end=1027,
+  serialized_start=997,
+  serialized_end=1026,
 )
 
 _EXPORTASSETSREQUEST.fields_by_name['read_time'].message_type = google_dot_protobuf_dot_timestamp__pb2._TIMESTAMP
-_EXPORTASSETSREQUEST.fields_by_name['content_types'].enum_type = _CONTENTTYPE
+_EXPORTASSETSREQUEST.fields_by_name['content_type'].enum_type = _CONTENTTYPE
 _EXPORTASSETSREQUEST.fields_by_name['output_config'].message_type = _OUTPUTCONFIG
 _EXPORTASSETSRESPONSE.fields_by_name['read_time'].message_type = google_dot_protobuf_dot_timestamp__pb2._TIMESTAMP
 _EXPORTASSETSRESPONSE.fields_by_name['output_config'].message_type = _OUTPUTCONFIG
@@ -335,22 +335,23 @@
   
   Attributes:
       parent:
-          Required. The relative name of the root asset. It can only be
-          an organization number (e.g. "organizations/123") or a project
-          number (e.g. "projects/12345").
+          Required. The relative name of the root asset. Can only be an
+          organization number (such as "organizations/123"), or a
+          project id (such as "projects/my-project-id") or a project
+          number (such as "projects/12345").
       read_time:
-          Timestamp to take an asset snapshot. This can only be current
-          or past time. If not specified, the current time will be used.
-          Due to delays in resource data collection and indexing, there
-          is a volatile window during which running the same query may
-          get different results.
+          Timestamp to take an asset snapshot. This can only be set to a
+          timestamp in the past or of the current time. If not
+          specified, the current time will be used. Due to delays in
+          resource data collection and indexing, there is a volatile
+          window during which running the same query may get different
+          results.
       asset_types:
-          A list of asset types to take a snapshot for. Example:
-          "google.compute.disk". If specified, only matching assets will
-          be returned.
-      content_types:
-          A list of asset content types. If specified, only matching
-          content will be returned. Otherwise, no content but the asset
+          A list of asset types of which to take a snapshot for.
+          Example: "google.compute.disk". If specified, only matching
+          assets will be returned.
+      content_type:
+          Asset content type. If not specified, no content but the asset
           name will be returned.
       output_config:
           Required. Output configuration indicating where the results
@@ -374,10 +375,10 @@
   
   Attributes:
       read_time:
-          Required. Time the snapshot was taken.
+          Time the snapshot was taken.
       output_config:
-          Required. Output configuration indicating where the results
-          were output to. All results are in JSON format.
+          Output configuration indicating where the results were output
+          to. All results are in JSON format.
   """,
   # @@protoc_insertion_point(class_scope:google.cloud.asset.v1beta1.ExportAssetsResponse)
   ))
@@ -393,20 +394,22 @@
   Attributes:
       parent:
           Required. The relative name of the root asset. It can only be
-          an organization ID (e.g. "organizations/123") or a project ID
-          (e.g. "projects/12345").
+          an organization number (such as "organizations/123"), or a
+          project id (such as "projects/my-project-id")"or a project
+          number (such as "projects/12345").
       asset_names:
           A list of the full names of the assets. See: https://cloud.goo
           gle.com/apis/design/resource\_names#full\_resource\_name
           Example: "//compute.googleapis.com/projects/my\_project\_123/z
           ones/zone1/instances/instance1".  The request becomes a no-op
-          if the asset name list is empty.
+          if the asset name list is empty, and the max size of the asset
+          name list is 100 in one request.
       content_type:
           Required. The content type.
       read_time_window:
-          Required. The time window for the asset history. The returned
-          results contain all temporal assets whose time window overlap
-          with read\_time\_window.
+          Required. The time window for the asset history. The start
+          time is required. The returned results contain all temporal
+          assets whose time window overlap with read\_time\_window.
   """,
   # @@protoc_insertion_point(class_scope:google.cloud.asset.v1beta1.BatchGetAssetsHistoryRequest)
   ))
@@ -472,8 +475,8 @@
   file=DESCRIPTOR,
   index=0,
   options=None,
-  serialized_start=1105,
-  serialized_end=1584,
+  serialized_start=1104,
+  serialized_end=1583,
   methods=[
   _descriptor.MethodDescriptor(
     name='ExportAssets',
diff --git a/asset/google/cloud/asset_v1beta1/proto/asset_service_pb2_grpc.py b/asset/google/cloud/asset_v1beta1/proto/asset_service_pb2_grpc.py
index af6db86e69dd..31dfb9ac0377 100644
--- a/asset/google/cloud/asset_v1beta1/proto/asset_service_pb2_grpc.py
+++ b/asset/google/cloud/asset_v1beta1/proto/asset_service_pb2_grpc.py
@@ -33,7 +33,7 @@ class AssetServiceServicer(object):
 
   def ExportAssets(self, request, context):
     """Exports assets with time and resource types to a given Google Cloud Storage
-    location. The output format is newline delimited JSON.
+    location. The output format is newline-delimited JSON.
     This API implements the [google.longrunning.Operation][google.longrunning.Operation] API allowing users
     to keep track of the export.
     """
diff --git a/asset/google/cloud/asset_v1beta1/proto/assets_pb2.py b/asset/google/cloud/asset_v1beta1/proto/assets_pb2.py
index a208e7309242..c4906f3dcc7e 100644
--- a/asset/google/cloud/asset_v1beta1/proto/assets_pb2.py
+++ b/asset/google/cloud/asset_v1beta1/proto/assets_pb2.py
@@ -273,10 +273,9 @@
   
   Attributes:
       start_time:
-          Start time of the time window (inclusive). Infinite past if
-          not specified.
+          Start time of the time window (inclusive).
       end_time:
-          End time of the time window (exclusive). Infinite future if
+          End time of the time window (exclusive). Current timestamp if
           not specified.
   """,
   # @@protoc_insertion_point(class_scope:google.cloud.asset.v1beta1.TimeWindow)
diff --git a/asset/google/cloud/asset_v1beta1/types.py b/asset/google/cloud/asset_v1beta1/types.py
index 70d21bbc6529..eb4c3d9023c9 100644
--- a/asset/google/cloud/asset_v1beta1/types.py
+++ b/asset/google/cloud/asset_v1beta1/types.py
@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+#
 # Copyright 2018 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/asset/nox.py b/asset/nox.py
index 58f8c2b507ce..884edf60d671 100644
--- a/asset/nox.py
+++ b/asset/nox.py
@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+#
 # Copyright 2018 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/asset/tests/unit/gapic/v1beta1/test_asset_service_client_v1beta1.py b/asset/tests/unit/gapic/v1beta1/test_asset_service_client_v1beta1.py
index 7a81844da464..1ab30f8ffff0 100644
--- a/asset/tests/unit/gapic/v1beta1/test_asset_service_client_v1beta1.py
+++ b/asset/tests/unit/gapic/v1beta1/test_asset_service_client_v1beta1.py
@@ -1,3 +1,5 @@
+# -*- coding: utf-8 -*-
+#
 # Copyright 2018 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -79,18 +81,15 @@ def test_export_assets(self):
 
         # Setup Request
         parent = client.project_path('[PROJECT]')
-        content_types = []
         output_config = {}
 
-        response = client.export_assets(parent, content_types, output_config)
+        response = client.export_assets(parent, output_config)
         result = response.result()
         assert expected_response == result
 
         assert len(channel.requests) == 1
         expected_request = asset_service_pb2.ExportAssetsRequest(
-            parent=parent,
-            content_types=content_types,
-            output_config=output_config)
+            parent=parent, output_config=output_config)
         actual_request = channel.requests[0][1]
         assert expected_request == actual_request
 
@@ -107,10 +106,9 @@ def test_export_assets_exception(self):
 
         # Setup Request
         parent = client.project_path('[PROJECT]')
-        content_types = []
         output_config = {}
 
-        response = client.export_assets(parent, content_types, output_config)
+        response = client.export_assets(parent, output_config)
         exception = response.exception()
         assert exception.errors[0] == error
 
@@ -126,18 +124,16 @@ def test_batch_get_assets_history(self):
 
         # Setup Request
         parent = client.project_path('[PROJECT]')
-        asset_names = []
         content_type = enums.ContentType.CONTENT_TYPE_UNSPECIFIED
         read_time_window = {}
 
-        response = client.batch_get_assets_history(
-            parent, asset_names, content_type, read_time_window)
+        response = client.batch_get_assets_history(parent, content_type,
+                                                   read_time_window)
         assert expected_response == response
 
         assert len(channel.requests) == 1
         expected_request = asset_service_pb2.BatchGetAssetsHistoryRequest(
             parent=parent,
-            asset_names=asset_names,
             content_type=content_type,
             read_time_window=read_time_window)
         actual_request = channel.requests[0][1]
@@ -150,10 +146,9 @@ def test_batch_get_assets_history_exception(self):
 
         # Setup request
         parent = client.project_path('[PROJECT]')
-        asset_names = []
         content_type = enums.ContentType.CONTENT_TYPE_UNSPECIFIED
         read_time_window = {}
 
         with pytest.raises(CustomException):
-            client.batch_get_assets_history(parent, asset_names, content_type,
+            client.batch_get_assets_history(parent, content_type,
                                             read_time_window)
