diff -r b52f0f221325 -r 951730b2b8ba mercurial/ui.py
--- a/mercurial/ui.py	Sat Nov 07 22:12:50 2009 +0100
+++ b/mercurial/ui.py	Sat Nov 07 22:13:09 2009 +0100
@@ -186,7 +186,7 @@
             except KeyError:
                 pass
         if not user:
-            raise util.Abort(_("Please specify a username."))
+            raise util.Abort(_('no username supplied (see "hg help config")'))
         if "\n" in user:
             raise util.Abort(_("username %s contains a newline\n") % repr(user))
         return user