From fdc30ef67b12b4a15ce01e15076a5ad0472bdcd1 Mon Sep 17 00:00:00 2001
From: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
Date: Fri, 11 Jul 2025 12:50:21 +0200
Subject: [PATCH] gh-76637: Note that `undefined` Codec is for testing
 (GH-136531)

Closes GH-76637
(cherry picked from commit 975b57d945c84000949f241ded8f44413ecc6217)

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
---
 Doc/library/codecs.rst | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Doc/library/codecs.rst b/Doc/library/codecs.rst
index a8f8c884d218a6..ec0644279e738d 100644
--- a/Doc/library/codecs.rst
+++ b/Doc/library/codecs.rst
@@ -1384,7 +1384,11 @@ encodings.
 |                    |         | It is used in the Python  |
 |                    |         | pickle protocol.          |
 +--------------------+---------+---------------------------+
-| undefined          |         | Raise an exception for    |
+| undefined          |         | This Codec should only    |
+|                    |         | be used for testing       |
+|                    |         | purposes.                 |
+|                    |         |                           |
+|                    |         | Raise an exception for    |
 |                    |         | all conversions, even     |
 |                    |         | empty strings. The error  |
 |                    |         | handler is ignored.       |