Merged revisions 73812 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r73812 | benjamin.peterson | 2009-07-03 09:08:20 -0500 (Fri, 03 Jul 2009) | 1 line

  another cStringIO restriction
........
diff --git a/Doc/library/stringio.rst b/Doc/library/stringio.rst
index f7f6771..30a5bac 100644
--- a/Doc/library/stringio.rst
+++ b/Doc/library/stringio.rst
@@ -72,8 +72,9 @@
 instead.
 
 Since this module provides a factory function which returns objects of built-in
-types, there's no way to build your own version using subclassing.  Use the
-original :mod:`StringIO` module in that case.
+types, there's no way to build your own version using subclassing.  It's not
+possible to set attributes on it.  Use the original :mod:`StringIO` module in
+those cases.
 
 Unlike the memory files implemented by the :mod:`StringIO` module, those
 provided by this module are not able to accept Unicode strings that cannot be