add reference in text rst

charlesdong1991 · charlesdong1991 · commit 3448d76648cd · 2019-02-23T22:03:19.000+01:00
diff --git a/doc/source/user_guide/text.rst b/doc/source/user_guide/text.rst
@@ -618,3 +618,4 @@ Method Summary
     :meth:`~Series.str.istitle`;Equivalent to ``str.istitle``
     :meth:`~Series.str.isnumeric`;Equivalent to ``str.isnumeric``
     :meth:`~Series.str.isdecimal`;Equivalent to ``str.isdecimal``
+    :meth:`~Series.str.casefold`;Equivalent to ``str.casefold``
