diff -r 0079fb98e8d0 -r ed720c7cc97d mercurial/dispatch.py
--- a/mercurial/dispatch.py	Wed Feb 16 21:02:19 2011 -0200
+++ b/mercurial/dispatch.py	Wed Feb 16 21:02:41 2011 -0200
@@ -226,7 +226,7 @@
                     elif int(m.groups()[0]) <= len(args):
                         return m.group()
                     else:
-                        ui.debug(_("No argument found for substitution"
+                        ui.debug(_("No argument found for substitution "
                                    "of %i variable in alias '%s' definition.")
                                  % (int(m.groups()[0]), self.name))
                         return ''