diff --git a/google/cloud/asset/asset_v1beta1.yaml b/google/cloud/asset/asset_v1beta1.yaml
index 73f0ba39..d1edc78b 100644
--- a/google/cloud/asset/asset_v1beta1.yaml
+++ b/google/cloud/asset/asset_v1beta1.yaml
@@ -11,115 +11,13 @@ documentation:
   overview: |-
     # Cloud Asset API
 
-    The Cloud Asset API keeps a 5-week history of Google Cloud Platform (GCP)
-    asset metadata, and allows GCP users to download a dump of all asset
-    metadata for the resource types listed below within an organization or a
-    project at a given timestamp.
+    The Cloud Asset API keeps a history of Google Cloud Platform (GCP) asset
+    metadata, and allows GCP users to download a dump of all asset metadata for
+    the resource types listed below within an organization or a project at a
+    given timestamp.
 
-    ## API reference pages
-
-    <a href="rest/index.html">REST API documentation</a>
-
-    <a href="rpc/index.html">RPC API documentation</a>
-
-    ## Currently supported resource types
-
-    The Cloud Asset API currently supports the following GCP resource types and
-    the [Identity and Access Management (IAM)
-    Policy](https://cloud.google.com/iam/reference/rest/v1/Policy) on them:
-
-    [Cloud Resource
-    Manager](https://cloudresourcemanager.googleapis.com/$discovery/rest)
-
-    * `google.cloud.resourcemanager.Organization`
-
-    * `google.cloud.resourcemanager.Folder`
-
-    * `google.cloud.resourcemanager.Project`
-
-    [Compute
-    Engine](https://www.googleapis.com/discovery/v1/apis/compute/v1/rest)
-
-    * `google.compute.Autoscaler`
-
-    * `google.compute.BackendBucket`
-
-    * `google.compute.BackendService`
-
-    * `google.compute.Disk`
-
-    * `google.compute.Firewall`
-
-    * `google.compute.HealthCheck`
-
-    * `google.compute.HttpHealthCheck`
-
-    * `google.compute.HttpsHealthCheck`
-
-    * `google.compute.Image`
-
-    * `google.compute.Instance`
-
-    * `google.compute.InstanceGroup`
-
-    * `google.compute.InstanceTemplate`
-
-    * `google.compute.License`
-
-    * `google.compute.Network`
-
-    * `google.compute.Snapshot`
-
-    * `google.compute.SslCertificate`
-
-    * `google.compute.Subnetwork`
-
-    * `google.compute.TargetHttpProxy`
-
-    * `google.compute.TargetHttpsProxy`
-
-    * `google.compute.TargetInstance`
-
-    * `google.compute.TargetPool`
-
-    * `google.compute.TargetTcpProxy`
-
-    * `google.compute.TargetSslProxy`
-
-    * `google.compute.TargetVpnGateway`
-
-    * `google.compute.UrlMap`
-
-    [App Engine](https://www.googleapis.com/discovery/v1/apis/appengine/v1/rest)
-
-    * `google.appengine.Application`
-
-    * `google.appengine.Service`
-
-    * `google.appengine.Version`
-
-    [Cloud
-    Billing](https://www.googleapis.com/discovery/v1/apis/cloudbilling/v1/rest)
-
-    * `google.cloud.billing.BillingAccount`
-
-    [Cloud
-    Storage](https://www.googleapis.com/discovery/v1/apis/storage/v1/rest)
-
-    * `google.cloud.storage.Bucket`
-
-    [Cloud DNS](https://www.googleapis.com/discovery/v1/apis/dns/v1alpha2/rest)
-
-    * `google.cloud.dns.ManagedZone`
-
-    * `google.cloud.dns.Policy`
-
-    [Cloud
-    Spanner](https://www.googleapis.com/discovery/v1/apis/spanner/v1/rest)
-
-    * `google.spanner.Instance`
-
-    * `google.spanner.Database`
+    Read more documents here:
+    https://cloud.google.com/resource-manager/docs/cloud-asset-inventory/overview
 
 backend:
   rules:
@@ -143,8 +41,12 @@ http:
 
     - get: '/v1beta1/{name=projects/*/operations/*/*}'
 
+    - get: '/v1beta1/{name=folders/*/operations/*/*}'
+
     - get: '/v1beta1/{name=organizations/*/operations/*/*}'
 
+    - get: '/v1/{name=*/*/operations/*/*}'
+
 
 authentication:
   rules:
diff --git a/google/cloud/asset/v1beta1/asset_service.proto b/google/cloud/asset/v1beta1/asset_service.proto
index aaaa0ba2..16e0789e 100644
--- a/google/cloud/asset/v1beta1/asset_service.proto
+++ b/google/cloud/asset/v1beta1/asset_service.proto
@@ -40,6 +40,10 @@ service AssetService {
     option (google.api.http) = {
       post: "/v1beta1/{parent=projects/*}:exportAssets"
       body: "*"
+      additional_bindings {
+        post: "/v1beta1/{parent=folders/*}:exportAssets"
+        body: "*"
+      }
       additional_bindings {
         post: "/v1beta1/{parent=organizations/*}:exportAssets"
         body: "*"
@@ -64,20 +68,24 @@ service AssetService {
 
 // Export asset request.
 message ExportAssetsRequest {
-  // Required. The relative name of the root asset. This can only be an organization
-  // number (such as "organizations/123"), a project ID (such as
-  // "projects/my-project-id"), or a project number (such as "projects/12345").
+  // Required. The relative name of the root asset. This can only be an
+  // organization number (such as "organizations/123"), a project ID (such as
+  // "projects/my-project-id"), a project number (such as "projects/12345"), or
+  // a folder number (such as "folders/123").
   string parent = 1;
 
-  // 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.
+  // Timestamp to take an asset snapshot. This can only be set to a timestamp
+  // between 2018-10-02 UTC (inclusive) and 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.
   google.protobuf.Timestamp read_time = 2;
 
   // A list of asset types of which to take a snapshot for. For example:
-  // "google.compute.disk". If specified, only matching assets will be returned.
+  // "google.compute.Disk". If specified, only matching assets will be returned.
+  // See [Introduction to Cloud Asset
+  // Inventory](https://cloud.google.com/resource-manager/docs/cloud-asset-inventory/overview)
+  // for all supported asset types.
   repeated string asset_types = 3;
 
   // Asset content type. If not specified, no content but the asset name will be
@@ -120,9 +128,12 @@ message BatchGetAssetsHistoryRequest {
   // Required. The content type.
   ContentType content_type = 3;
 
-  // 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.
+  // Optional. The time window for the asset history. Both start_time and
+  // end_time are optional and if set, it must be after 2018-10-02 UTC. If
+  // end_time is not set, it is default to current timestamp. If start_time is
+  // not set, the snapshot of the assets at end_time will be returned. The
+  // returned results contain all temporal assets whose time window overlap with
+  // read_time_window.
   TimeWindow read_time_window = 4;
 }
 
@@ -143,10 +154,15 @@ message OutputConfig {
 
 // A Cloud Storage location.
 message GcsDestination {
-  // The path of the Cloud Storage objects. It's the same path that is used by
-  //  gsutil. For example: "gs://bucket_name/object_path". See [Viewing and Editing Object Metadata](https://cloud.google.com/storage/docs/viewing-editing-metadata)
-  // for more information.
-  string uri = 1;
+  // Required.
+  oneof object_uri {
+    // The uri of the Cloud Storage object. It's the same uri that is used by
+    // gsutil. For example: "gs://bucket_name/object_name". See [Viewing and
+    // Editing Object
+    // Metadata](https://cloud.google.com/storage/docs/viewing-editing-metadata)
+    // for more information.
+    string uri = 1;
+  }
 }
 
 // Asset content type.
diff --git a/google/cloud/asset/v1beta1/assets.proto b/google/cloud/asset/v1beta1/assets.proto
index 5d339a20..cde70cdd 100644
--- a/google/cloud/asset/v1beta1/assets.proto
+++ b/google/cloud/asset/v1beta1/assets.proto
@@ -44,12 +44,12 @@ message TemporalAsset {
   Asset asset = 3;
 }
 
-// A time window of [start_time, end_time).
+// A time window of (start_time, end_time].
 message TimeWindow {
-  // Start time of the time window (inclusive).
+  // Start time of the time window (exclusive).
   google.protobuf.Timestamp start_time = 1;
 
-  // End time of the time window (exclusive).
+  // End time of the time window (inclusive).
   // Current timestamp if not specified.
   google.protobuf.Timestamp end_time = 2;
 }
@@ -62,7 +62,7 @@ message Asset {
   // for more information.
   string name = 1;
 
-  // Type of the asset. Example: "google.compute.disk".
+  // Type of the asset. Example: "google.compute.Disk".
   string asset_type = 2;
 
   // Representation of the resource.
diff --git a/google/cloud/asset/v1beta1/cloudasset_gapic.yaml b/google/cloud/asset/v1beta1/cloudasset_gapic.yaml
index d1df7b13..83890597 100644
--- a/google/cloud/asset/v1beta1/cloudasset_gapic.yaml
+++ b/google/cloud/asset/v1beta1/cloudasset_gapic.yaml
@@ -46,8 +46,8 @@ interfaces:
   retry_codes_def:
   - name: idempotent
     retry_codes:
-    - UNAVAILABLE
     - DEADLINE_EXCEEDED
+    - UNAVAILABLE
   - name: non_idempotent
     retry_codes: []
   # Definition for retry/backoff parameters.
@@ -75,6 +75,7 @@ interfaces:
   #
   #   required_fields - Fields that are always required for a request to be
   #   valid.
+  #
   #   resource_name_treatment - An enum that specifies how to treat the resource
   #   name formats defined in the field_name_patterns and
   #   response_field_name_patterns fields.