diff --git a/gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/client.py.j2 b/gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/client.py.j2
index 2426f5bc45..4666ab3e0f 100644
--- a/gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/client.py.j2
+++ b/gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/client.py.j2
@@ -233,6 +233,11 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
             transport (Union[str, {{ service.name }}Transport]): The
                 transport to use. If set to None, a transport is chosen
                 automatically.
+                {% if 'rest' in opts.transport and not opts.rest_numeric_enums %}
+                NOTE: "rest" transport functionality is currently in a
+                beta state (preview). We welcome your feedback via an
+                issue in this library's source repository.
+                {% endif %}
             client_options (google.api_core.client_options.ClientOptions): Custom options for the
                 client. It won't take effect if a ``transport`` instance is provided.
                 (1) The ``api_endpoint`` property can be used to override the
diff --git a/gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/transports/rest.py.j2 b/gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/transports/rest.py.j2
index feaa18f44b..99156e3251 100644
--- a/gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/transports/rest.py.j2
+++ b/gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/transports/rest.py.j2
@@ -128,6 +128,12 @@ class {{service.name}}RestTransport({{service.name}}Transport):
     and call it.
 
     It sends JSON representations of protocol buffers over HTTP/1.1
+
+    {% if not opts.rest_numeric_enums %}
+    NOTE: This REST transport functionality is currently in a beta
+    state (preview). We welcome your feedback via an issue in this
+    library's source repository. Thank you!
+    {% endif %}
     """
 
 
@@ -147,6 +153,12 @@ class {{service.name}}RestTransport({{service.name}}Transport):
             ) -> None:
         """Instantiate the transport.
 
+       {% if not opts.rest_numeric_enums %}
+       NOTE: This REST transport functionality is currently in a beta
+       state (preview). We welcome your feedback via a GitHub issue in
+       this library's repository. Thank you!
+       {% endif %}
+
         Args:
             host ({% if service.host %}Optional[str]{% else %}str{% endif %}):
                 {{ ' ' }}The hostname to connect to.
diff --git a/gapic/templates/%namespace/%name_%version/%sub/services/%service/client.py.j2 b/gapic/templates/%namespace/%name_%version/%sub/services/%service/client.py.j2
index 9a4bc5d3e6..be54b73db8 100644
--- a/gapic/templates/%namespace/%name_%version/%sub/services/%service/client.py.j2
+++ b/gapic/templates/%namespace/%name_%version/%sub/services/%service/client.py.j2
@@ -290,6 +290,11 @@ class {{ service.client_name }}(metaclass={{ service.client_name }}Meta):
             transport (Union[str, {{ service.name }}Transport]): The
                 transport to use. If set to None, a transport is chosen
                 automatically.
+                {% if 'rest' in opts.transport and not opts.rest_numeric_enums %}
+                NOTE: "rest" transport functionality is currently in a
+                beta state (preview). We welcome your feedback via an
+                issue in this library's source repository.
+                {% endif %}
             client_options (google.api_core.client_options.ClientOptions): Custom options for the
                 client. It won't take effect if a ``transport`` instance is provided.
                 (1) The ``api_endpoint`` property can be used to override the
diff --git a/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest.py.j2 b/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest.py.j2
index ea1d45af0f..5f5c46660d 100644
--- a/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest.py.j2
+++ b/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest.py.j2
@@ -134,6 +134,12 @@ class {{service.name}}RestTransport({{service.name}}Transport):
     and call it.
 
     It sends JSON representations of protocol buffers over HTTP/1.1
+
+    {% if not opts.rest_numeric_enums %}
+    NOTE: This REST transport functionality is currently in a beta
+    state (preview). We welcome your feedback via an issue in this
+    library's source repository. Thank you!
+    {% endif %}
     """
 
 
@@ -154,6 +160,12 @@ class {{service.name}}RestTransport({{service.name}}Transport):
             ) -> None:
         """Instantiate the transport.
 
+       {% if not opts.rest_numeric_enums %}
+       NOTE: This REST transport functionality is currently in a beta
+       state (preview). We welcome your feedback via a GitHub issue in
+       this library's repository. Thank you!
+       {% endif %}
+
         Args:
             host ({% if service.host %}Optional[str]{% else %}str{% endif %}):
                 {{ ' ' }}The hostname to connect to.