diff --git a/stdlib/3/urllib/request.pyi b/stdlib/3/urllib/request.pyi
index b043a115e..63152d445 100644
--- a/stdlib/3/urllib/request.pyi
+++ b/stdlib/3/urllib/request.pyi
@@ -34,6 +34,7 @@ def pathname2url(path: str) -> str: ...
 def getproxies() -> Dict[str, str]: ...
 def parse_http_list(s: str) -> List[str]: ...
 def parse_keqv_list(l: List[str]) -> Dict[str, str]: ...
+def proxy_bypass(host: str) -> Any: ...  # Undocumented
 
 class Request:
     @property