diff --git a/tensorflow/core/api_def/base_api/api_def_ApplyCenteredRMSProp.pbtxt b/tensorflow/core/api_def/base_api/api_def_ApplyCenteredRMSProp.pbtxt
index c88d18d3b20..03f4020c45a 100644
--- a/tensorflow/core/api_def/base_api/api_def_ApplyCenteredRMSProp.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_ApplyCenteredRMSProp.pbtxt
@@ -34,6 +34,12 @@ END
     name: "rho"
     description: <<END
 Decay rate. Must be a scalar.
+END
+  }
+  in_arg {
+    name: "momentum"
+    description: <<END
+Momentum Scale. Must be a scalar.
 END
   }
   in_arg {
diff --git a/tensorflow/core/api_def/base_api/api_def_ResourceApplyCenteredRMSProp.pbtxt b/tensorflow/core/api_def/base_api/api_def_ResourceApplyCenteredRMSProp.pbtxt
index 9cc033cc897..3f306768711 100644
--- a/tensorflow/core/api_def/base_api/api_def_ResourceApplyCenteredRMSProp.pbtxt
+++ b/tensorflow/core/api_def/base_api/api_def_ResourceApplyCenteredRMSProp.pbtxt
@@ -34,6 +34,12 @@ END
     name: "rho"
     description: <<END
 Decay rate. Must be a scalar.
+END
+  }
+  in_arg {
+    name: "momentum"
+    description: <<END
+Momentum Scale. Must be a scalar.
 END
   }
   in_arg {