diff --git a/Doc/library/urllib.request.rst b/Doc/library/urllib.request.rst
index 945c96892f592a..4107017021f5ab 100644
--- a/Doc/library/urllib.request.rst
+++ b/Doc/library/urllib.request.rst
@@ -1442,7 +1442,8 @@ some point in the future.
 .. function:: urlcleanup()
 
    Cleans up temporary files that may have been left behind by previous
-   calls to :func:`urlretrieve`.
+   calls to :func:`urlretrieve`.  It also resets the default global opener
+   installed by :func:`install_opener`.
 
 .. class:: URLopener(proxies=None, **x509)