diff --git a/stdlib/2/urllib.pyi b/stdlib/2/urllib.pyi
index 8b44a066e..fe0449489 100644
--- a/stdlib/2/urllib.pyi
+++ b/stdlib/2/urllib.pyi
@@ -128,7 +128,7 @@ def quote_plus(s: AnyStr, safe: Text = ...) -> AnyStr: ...
 def urlencode(query: Union[Sequence[Tuple[Any, Any]], Mapping[Any, Any]], doseq=...) -> str: ...
 
 def getproxies() -> Mapping[str, str]: ...
-def proxy_bypass(host): ...
+def proxy_bypass(host: str) -> Any: ...  # Undocumented
 
 # Names in __all__ with no definition:
 #   basejoin