diff --git a/google/pubsub_v1/types/pubsub.py b/google/pubsub_v1/types/pubsub.py
index 74b65549b..6f27edfee 100644
--- a/google/pubsub_v1/types/pubsub.py
+++ b/google/pubsub_v1/types/pubsub.py
@@ -1119,7 +1119,7 @@ class JavaScriptUDF(proto.Message):
                  *
                  * @param  {Object<string, any>} metadata - Pub/Sub message metadata.
                  * Keys:
-                 *   - (required) 'message_id'  : {string}
+                 *   - (optional) 'message_id'  : {string}
                  *   - (optional) 'publish_time': {string} YYYY-MM-DDTHH:MM:SSZ format
                  *   - (optional) 'ordering_key': {string}
                  */
diff --git a/samples/generated_samples/snippet_metadata_google.pubsub.v1.json b/samples/generated_samples/snippet_metadata_google.pubsub.v1.json
index 9f802d89d..dd0d6423a 100644
--- a/samples/generated_samples/snippet_metadata_google.pubsub.v1.json
+++ b/samples/generated_samples/snippet_metadata_google.pubsub.v1.json
@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-pubsub",
-    "version": "2.29.0"
+    "version": "0.1.0"
   },
   "snippets": [
     {