bpo-46494: Mention the typing_extensions pkg in typing docs (GH-31260)

miss-islington · meersuri · web-flow · commit 0c718e02f60f · 2022-03-07T20:29:09.000-08:00
(cherry picked from commit 8debeed) Co-authored-by: Meer Suri <46469858+meersuri@users.noreply.github.com>
diff --git a/Doc/library/typing.rst b/Doc/library/typing.rst
@@ -32,6 +32,10 @@ In the function ``greeting``, the argument ``name`` is expected to be of type
 :class:`str` and the return type :class:`str`. Subtypes are accepted as
 arguments.
 
+New features are frequently added to the ``typing`` module.
+The `typing_extensions <https://pypi.org/project/typing-extensions/>`_ package
+provides backports of these new features to older versions of Python.
+
 .. _relevant-peps:
 
 Relevant PEPs
