--- a/mercurial/configitems.py	Wed Oct 11 03:54:05 2017 +0200
+++ b/mercurial/configitems.py	Wed Oct 11 03:54:19 2017 +0200
@@ -206,6 +206,9 @@
 coreconfigitem('email', 'method',
     default='smtp',
 )
+coreconfigitem('email', 'reply-to',
+    default=None,
+)
 coreconfigitem('experimental', 'allowdivergence',
     default=False,
 )