diff --git a/stdlib/3/shutil.pyi b/stdlib/3/shutil.pyi
index 2ddd3d60a..746542c18 100644
--- a/stdlib/3/shutil.pyi
+++ b/stdlib/3/shutil.pyi
@@ -44,3 +44,5 @@ def register_unpack_format(name: str, extensions: List[str], function: Any,
                            description: str = ...) -> None: ...
 def unregister_unpack_format(name: str) -> None: ...
 def get_unpack_formats() -> List[Tuple[str, List[str], str]]: ...
+
+def which(cmd: str, mode: int = ..., path: str = ...): ...