Issue #11699: fix documentation of OptionParser.get_option_group. Patch by Petri Lehtinen
diff --git a/Doc/library/optparse.rst b/Doc/library/optparse.rst
index d4b121b..39a44bd 100644
--- a/Doc/library/optparse.rst
+++ b/Doc/library/optparse.rst
@@ -657,8 +657,9 @@
.. method:: OptionParser.get_option_group(opt_str)
- Return, if defined, the :class:`OptionGroup` that has the title or the long
- description equals to *opt_str*
+ Return the :class:`OptionGroup` to which the short or long option
+ string *opt_str* (e.g. ``'-o'`` or ``'--option'``) belongs. If
+ there's no such :class:`OptionGroup`, return ``None``.
.. _optparse-printing-version-string: