Index: django/core/urlresolvers.py
===================================================================
--- django/core/urlresolvers.py	(revision 8225)
+++ django/core/urlresolvers.py	(working copy)
@@ -288,7 +288,7 @@
             raise NoReverseMatch
         if lookup_view in self.reverse_dict:
             return u''.join([reverse_helper(part.regex, *args, **kwargs) for part in self.reverse_dict[lookup_view]])
-        raise NoReverseMatch
+        raise NoReverseMatch('Unable to find reverse match for "%s"' % lookup_view)
 
     def reverse_helper(self, lookup_view, *args, **kwargs):
         sub_match = self.reverse(lookup_view, *args, **kwargs)