mercurial/configitems.py

--- a/mercurial/configitems.py	Sat Oct 13 05:02:55 2018 -0700
+++ b/mercurial/configitems.py	Sat Oct 13 05:43:39 2018 -0700
@@ -703,6 +703,10 @@
     default=False,
     generic=True,
 )
+coreconfigitem('help', 'hidden-topic\..*',
+    default=False,
+    generic=True,
+)
 coreconfigitem('hooks', '.*',
     default=dynamicdefault,
     generic=True,