From a281d666508bad11cdecd2b75687fb04bd3ee7b8 Mon Sep 17 00:00:00 2001
From: David Sanders <>
Date: Thu, 29 Oct 2020 23:11:34 +1100
Subject: [PATCH] bpo-42194: Add "New in version: 3.9" to
 argparse.BooleanOptionalAction

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

diff --git a/Doc/library/argparse.rst b/Doc/library/argparse.rst
index 7a7a4cf94979a19..ed2bd3a0945e8af 100644
--- a/Doc/library/argparse.rst
+++ b/Doc/library/argparse.rst
@@ -853,6 +853,8 @@ is available in ``argparse`` and adds support for boolean actions such as
     >>> parser.parse_args(['--no-foo'])
     Namespace(foo=False)
 
+.. versionadded:: 3.9
+
 The recommended way to create a custom action is to extend :class:`Action`,
 overriding the ``__call__`` method and optionally the ``__init__`` and
 ``format_usage`` methods.