diff --git a/stdlib/2and3/argparse.pyi b/stdlib/2and3/argparse.pyi
index 23ea2c08b..4871afb32 100644
--- a/stdlib/2and3/argparse.pyi
+++ b/stdlib/2and3/argparse.pyi
@@ -63,7 +63,8 @@ class _ActionsContainer:
                      help: Optional[_Text] = ...,
                      metavar: Union[_Text, Tuple[_Text, ...]] = ...,
                      dest: Optional[_Text] = ...,
-                     version: _Text = ...) -> Action: ...
+                     version: _Text = ...,
+                     **kwargs: Any) -> Action: ...
     def add_argument_group(self, *args: Any, **kwargs: Any) -> _ArgumentGroup: ...
     def add_mutually_exclusive_group(self, **kwargs: Any) -> _MutuallyExclusiveGroup: ...
     def _add_action(self, action: _ActionT) -> _ActionT: ...