diff -r b888c9043566 Doc/library/test.rst
--- a/Doc/library/test.rst	Sun Feb 03 00:23:58 2013 +0100
+++ b/Doc/library/test.rst	Sat Feb 09 16:01:17 2013 +0530
@@ -365,7 +365,7 @@
 .. function:: captured_stdout()
 
    A context manager that runs the :keyword:`with` statement body using
-   a :class:`StringIO.StringIO` object as sys.stdout.  That object can be
+   a :class:`io.StringIO` object as sys.stdout.  That object can be
    retrieved using the ``as`` clause of the :keyword:`with` statement.
 
    Example use::