diff --git a/src/python/grpcio/grpc/__init__.py b/src/python/grpcio/grpc/__init__.py
index 8c15e540825..88c5b6d5be5 100644
--- a/src/python/grpcio/grpc/__init__.py
+++ b/src/python/grpcio/grpc/__init__.py
@@ -389,7 +389,8 @@ class ClientCallDetails(six.with_metaclass(abc.ABCMeta)):
       metadata: Optional :term:`metadata` to be transmitted to
         the service-side of the RPC.
       credentials: An optional CallCredentials for the RPC.
-      wait_for_ready: An optional flag to enable wait for ready mechanism.
+      wait_for_ready: This is an EXPERIMENTAL argument. An optional flag t
+        enable wait for ready mechanism.
     """
 
 
@@ -656,8 +657,8 @@ class UnaryUnaryMultiCallable(six.with_metaclass(abc.ABCMeta)):
           metadata: Optional :term:`metadata` to be transmitted to the
             service-side of the RPC.
           credentials: An optional CallCredentials for the RPC.
-          wait_for_ready: An optional flag to enable wait for ready
-            mechanism
+          wait_for_ready: This is an EXPERIMENTAL argument. An optional
+            flag to enable wait for ready mechanism
 
         Returns:
           The response value for the RPC.
@@ -685,8 +686,8 @@ class UnaryUnaryMultiCallable(six.with_metaclass(abc.ABCMeta)):
           metadata: Optional :term:`metadata` to be transmitted to the
             service-side of the RPC.
           credentials: An optional CallCredentials for the RPC.
-          wait_for_ready: An optional flag to enable wait for ready
-            mechanism
+          wait_for_ready: This is an EXPERIMENTAL argument. An optional
+            flag to enable wait for ready mechanism
 
         Returns:
           The response value for the RPC and a Call value for the RPC.
@@ -714,8 +715,8 @@ class UnaryUnaryMultiCallable(six.with_metaclass(abc.ABCMeta)):
           metadata: Optional :term:`metadata` to be transmitted to the
             service-side of the RPC.
           credentials: An optional CallCredentials for the RPC.
-          wait_for_ready: An optional flag to enable wait for ready
-            mechanism
+          wait_for_ready: This is an EXPERIMENTAL argument. An optional
+            flag to enable wait for ready mechanism
 
         Returns:
             An object that is both a Call for the RPC and a Future.
@@ -746,8 +747,8 @@ class UnaryStreamMultiCallable(six.with_metaclass(abc.ABCMeta)):
           metadata: An optional :term:`metadata` to be transmitted to the
             service-side of the RPC.
           credentials: An optional CallCredentials for the RPC.
-          wait_for_ready: An optional flag to enable wait for ready
-            mechanism
+          wait_for_ready: This is an EXPERIMENTAL argument. An optional
+            flag to enable wait for ready mechanism
 
         Returns:
             An object that is both a Call for the RPC and an iterator of
@@ -778,8 +779,8 @@ class StreamUnaryMultiCallable(six.with_metaclass(abc.ABCMeta)):
           metadata: Optional :term:`metadata` to be transmitted to the
             service-side of the RPC.
           credentials: An optional CallCredentials for the RPC.
-          wait_for_ready: An optional flag to enable wait for ready
-            mechanism
+          wait_for_ready: This is an EXPERIMENTAL argument. An optional
+            flag to enable wait for ready mechanism
 
         Returns:
           The response value for the RPC.
@@ -808,8 +809,8 @@ class StreamUnaryMultiCallable(six.with_metaclass(abc.ABCMeta)):
           metadata: Optional :term:`metadata` to be transmitted to the
             service-side of the RPC.
           credentials: An optional CallCredentials for the RPC.
-          wait_for_ready: An optional flag to enable wait for ready
-            mechanism
+          wait_for_ready: This is an EXPERIMENTAL argument. An optional
+            flag to enable wait for ready mechanism
 
         Returns:
           The response value for the RPC and a Call object for the RPC.
@@ -837,8 +838,8 @@ class StreamUnaryMultiCallable(six.with_metaclass(abc.ABCMeta)):
           metadata: Optional :term:`metadata` to be transmitted to the
             service-side of the RPC.
           credentials: An optional CallCredentials for the RPC.
-          wait_for_ready: An optional flag to enable wait for ready
-            mechanism
+          wait_for_ready: This is an EXPERIMENTAL argument. An optional
+            flag to enable wait for ready mechanism
 
         Returns:
             An object that is both a Call for the RPC and a Future.
@@ -869,8 +870,8 @@ class StreamStreamMultiCallable(six.with_metaclass(abc.ABCMeta)):
           metadata: Optional :term:`metadata` to be transmitted to the
             service-side of the RPC.
           credentials: An optional CallCredentials for the RPC.
-          wait_for_ready: An optional flag to enable wait for ready
-            mechanism
+          wait_for_ready: This is an EXPERIMENTAL argument. An optional
+            flag to enable wait for ready mechanism
 
         Returns:
             An object that is both a Call for the RPC and an iterator of