From 536b66f8fa6f8374bd8083ff2ce6a5796791b45f Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Tue, 23 Jan 2024 02:07:34 +0100
Subject: [PATCH] [3.12] gh-66944: Note that the `contextlib.closing` example
 is for illustrative purposes (GH-112198) (#114458)

---
 Doc/library/contextlib.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Doc/library/contextlib.rst b/Doc/library/contextlib.rst
index aab319cbe74..b73373bc236 100644
--- a/Doc/library/contextlib.rst
+++ b/Doc/library/contextlib.rst
@@ -182,6 +182,14 @@ Functions and classes provided:
    without needing to explicitly close ``page``.  Even if an error occurs,
    ``page.close()`` will be called when the :keyword:`with` block is exited.
 
+   .. note::
+
+      Most types managing resources support the :term:`context manager` protocol,
+      which closes *thing* on leaving the :keyword:`with` statment.
+      As such, :func:`!closing` is most useful for third party types that don't
+      support context managers.
+      This example is purely for illustration purposes,
+      as :func:`~urllib.request.urlopen` would normally be used in a context manager.
 
 .. function:: aclosing(thing)