DOC: added to whatsnew

jacobaustin123 · jacobaustin123 · commit 09f1cf6b02d7 · 2019-07-04T16:01:32.000-07:00
diff --git a/doc/source/whatsnew/v0.25.1.rst b/doc/source/whatsnew/v0.25.1.rst
@@ -10,6 +10,7 @@ What's new in 0.25.1 (July XX, 2019)
 Enhancements
 ~~~~~~~~~~~~
 
+- :meth:`DataFrame.sort_values`, :meth:`DataFrame.sort_index`, :meth:`Series.sort_index`, and :meth:`Series.sort_index` now support the ``key`` argument which allows for custom sorting orders (:issue:`3942`)
 
 .. _whatsnew_0251.enhancements.other:
 
