--- a/tests/test-help.t	Tue Apr 18 14:51:32 2017 -0700
+++ b/tests/test-help.t	Wed Apr 19 17:04:22 2017 -0700
@@ -943,6 +943,8 @@
   Technical implementation topics
   """""""""""""""""""""""""""""""
   
+      To access a subtopic, use "hg help internals.{subtopic-name}"
+  
        bundles       Bundles
        censor        Censor
        changegroups  Changegroups