From 74142078b3b78fea7b4cd791e5c577c0c0964eb7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Batuhan=20Ta=C5=9Fkaya?=
 <47358913+isidentical@users.noreply.github.com>
Date: Sun, 20 Oct 2019 23:13:54 +0300
Subject: bpo-38531: document extend action's added version (GH-16865)

---
 Doc/library/argparse.rst | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Doc/library/argparse.rst b/Doc/library/argparse.rst
index 00115d5..818acf4 100644
--- a/Doc/library/argparse.rst
+++ b/Doc/library/argparse.rst
@@ -838,6 +838,8 @@ how the command-line arguments should be handled. The supplied actions are:
     >>> parser.parse_args(["--foo", "f1", "--foo", "f2", "f3", "f4"])
     Namespace(foo=['f1', 'f2', 'f3', 'f4'])
 
+  .. versionadded:: 3.8
+
 You may also specify an arbitrary action by passing an Action subclass or
 other object that implements the same interface. The ``BooleanOptionalAction``
 is available in ``argparse`` and adds support for boolean actions such as
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