diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index 60fadcaa4bc..15b64edd68c 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -1055,6 +1055,7 @@ are always available.  They are listed here in alphabetical order.
       The file is now non-inheritable.
 
    .. deprecated-removed:: 3.4 4.0
+
       The ``'U'`` mode.