diff -r a0c2a19d64e7 -r dd1357edff37 mercurial/configitems.py
--- a/mercurial/configitems.py	Tue Oct 10 10:49:28 2017 +0200
+++ b/mercurial/configitems.py	Sun Oct 08 21:02:02 2017 +0200
@@ -182,6 +182,10 @@
 coreconfigitem('commands', 'update.requiredest',
     default=False,
 )
+coreconfigitem('committemplate', '.*',
+    default=None,
+    generic=True,
+)
 coreconfigitem('debug', 'dirstate.delaywrite',
     default=0,
 )