--- a/hgext3rd/topic/__init__.py	Fri Sep 15 23:25:38 2017 +0530
+++ b/hgext3rd/topic/__init__.py	Sun Sep 17 19:59:25 2017 +0200
@@ -719,7 +719,7 @@
             elif -1 == data['behindcount']:
                 fm.plain(', ')
                 fm.write('behinderror', '%s',
-                         _('ambiguous destination'),
+                         _('ambiguous destination: %s') % data['behinderror'],
                          label='topic.list.behinderror')
             fm.plain(')')
         fm.plain('\n')