--- a/mercurial/configitems.py	Thu Feb 08 15:09:59 2018 -0800
+++ b/mercurial/configitems.py	Mon Feb 12 16:33:54 2018 -0800
@@ -556,6 +556,9 @@
 coreconfigitem('experimental', 'single-head-per-branch',
     default=False,
 )
+coreconfigitem('experimental', 'sshserver.support-v2',
+    default=False,
+)
 coreconfigitem('experimental', 'spacemovesdown',
     default=False,
 )