diff -r 262204877004 Doc/library/http.server.rst
--- a/Doc/library/http.server.rst	Mon Apr 14 11:20:45 2014 -0400
+++ b/Doc/library/http.server.rst	Tue Apr 15 13:48:24 2014 -0400
@@ -81,7 +81,8 @@
 
       Holds an instance of the class specified by the :attr:`MessageClass` class
       variable. This instance parses and manages the headers in the HTTP
-      request.
+      request. This attribute will not be set if the request cannot be parsed as
+      an HTTP request.
 
    .. attribute:: rfile