diff -r 361d83261d7a -r 5f4c42d4f2e8 hgext3rd/topic/__init__.py
--- a/hgext3rd/topic/__init__.py	Sat Sep 30 22:24:24 2017 +0100
+++ b/hgext3rd/topic/__init__.py	Sat Sep 30 22:42:52 2017 +0100
@@ -898,7 +898,7 @@
         elif not repo.currenttopic and topicmode == "enforce":
             msg = _("no active topic")
             hint = _("set a current topic or use '--config " +
-                     "experimental.enforce-topic=no' to commit without a topic")
+                     "experimental.topic-mode=off' to commit without a topic")
             raise error.Abort(msg, hint=hint)
         return orig(ui, repo, *args, **opts)