diff --git a/google/cloud/recommendationengine/v1beta1/catalog.proto b/google/cloud/recommendationengine/v1beta1/catalog.proto
index b2ef4e14..cfabb6c0 100644
--- a/google/cloud/recommendationengine/v1beta1/catalog.proto
+++ b/google/cloud/recommendationengine/v1beta1/catalog.proto
@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC.
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-//
 
 syntax = "proto3";
 
@@ -33,7 +32,7 @@ message CatalogItem {
   // Category represents catalog item category hierarchy.
   message CategoryHierarchy {
     // Required. Catalog item categories. Each category should be a UTF-8
-    // encoded string with a length limit of 1 KiB.
+    // encoded string with a length limit of 2 KiB.
     //
     // Note that the order in the list denotes the specificity (from least to
     // most specific).
@@ -88,11 +87,7 @@ message CatalogItem {
   // be a UTF-8 encoded string with a length limit of 1 KiB.
   //
   // This tag can be used for filtering recommendation results by passing the
-  // tag as part of the predict request filter. The tags have to satisfy the
-  // following restrictions:
-  //
-  // * Only contain alphanumeric characters (`a-z`, `A-Z`, `0-9`), underscores
-  //   (`_`) and dashes (`-`).
+  // tag as part of the predict request filter.
   repeated string tags = 8 [(google.api.field_behavior) = OPTIONAL];
 
   // Optional. Variant group identifier for prediction results. UTF-8 encoded
diff --git a/google/cloud/recommendationengine/v1beta1/catalog_service.proto b/google/cloud/recommendationengine/v1beta1/catalog_service.proto
index 97ec8173..a23d8d21 100644
--- a/google/cloud/recommendationengine/v1beta1/catalog_service.proto
+++ b/google/cloud/recommendationengine/v1beta1/catalog_service.proto
@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC.
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-//
 
 syntax = "proto3";
 
diff --git a/google/cloud/recommendationengine/v1beta1/common.proto b/google/cloud/recommendationengine/v1beta1/common.proto
index fdee0c1d..4fb2ba4b 100644
--- a/google/cloud/recommendationengine/v1beta1/common.proto
+++ b/google/cloud/recommendationengine/v1beta1/common.proto
@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC.
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-//
 
 syntax = "proto3";
 
diff --git a/google/cloud/recommendationengine/v1beta1/import.proto b/google/cloud/recommendationengine/v1beta1/import.proto
index ee34a038..d8a8fe54 100644
--- a/google/cloud/recommendationengine/v1beta1/import.proto
+++ b/google/cloud/recommendationengine/v1beta1/import.proto
@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC.
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-//
 
 syntax = "proto3";
 
diff --git a/google/cloud/recommendationengine/v1beta1/prediction_apikey_registry_service.proto b/google/cloud/recommendationengine/v1beta1/prediction_apikey_registry_service.proto
index c0f24635..b1462422 100644
--- a/google/cloud/recommendationengine/v1beta1/prediction_apikey_registry_service.proto
+++ b/google/cloud/recommendationengine/v1beta1/prediction_apikey_registry_service.proto
@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC.
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-//
 
 syntax = "proto3";
 
diff --git a/google/cloud/recommendationengine/v1beta1/prediction_service.proto b/google/cloud/recommendationengine/v1beta1/prediction_service.proto
index 12b0fded..4182bf09 100644
--- a/google/cloud/recommendationengine/v1beta1/prediction_service.proto
+++ b/google/cloud/recommendationengine/v1beta1/prediction_service.proto
@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC.
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-//
 
 syntax = "proto3";
 
diff --git a/google/cloud/recommendationengine/v1beta1/user_event.proto b/google/cloud/recommendationengine/v1beta1/user_event.proto
index 603d6937..fd11b42a 100644
--- a/google/cloud/recommendationengine/v1beta1/user_event.proto
+++ b/google/cloud/recommendationengine/v1beta1/user_event.proto
@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC.
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-//
 
 syntax = "proto3";
 
diff --git a/google/cloud/recommendationengine/v1beta1/user_event_service.proto b/google/cloud/recommendationengine/v1beta1/user_event_service.proto
index 714e9b38..12033693 100644
--- a/google/cloud/recommendationengine/v1beta1/user_event_service.proto
+++ b/google/cloud/recommendationengine/v1beta1/user_event_service.proto
@@ -1,4 +1,4 @@
-// Copyright 2019 Google LLC.
+// Copyright 2020 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -11,7 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-//
 
 syntax = "proto3";