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diff --git a/Doc/library/argparse.rst b/Doc/library/argparse.rst
index ee005594..5a61a5b 100644
--- a/Doc/library/argparse.rst
+++ b/Doc/library/argparse.rst
@@ -810,6 +810,8 @@ 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 recommended way to do
this is to extend :class:`Action`, overriding the ``__call__`` method