diff -r 5c7fdd4521be Doc/library/re.rst
--- a/Doc/library/re.rst	Tue Feb 07 08:37:23 2017 +0100
+++ b/Doc/library/re.rst	Tue Feb 07 16:04:49 2017 +0100
@@ -42,6 +42,13 @@
 that don't require you to compile a regex object first, but miss some
 fine-tuning parameters.
 
+.. seealso::
+
+ The `regex module on PyPI <https://pypi.python.org/pypi/regex/>`_.
+ That is a third-party alternative regular expression module, mostly
+ compatible with the :mod:`re` module's API, but with additional
+ features.
+
 
 .. _re-syntax:
 
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<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://bugs.python.org/file46561/regex_reference.patch">(-&gt;オリジナル)</a>
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