--- a/mercurial/configitems.py	Fri Jun 30 03:32:09 2017 +0200
+++ b/mercurial/configitems.py	Fri Jun 30 03:27:18 2017 +0200
@@ -56,6 +56,9 @@
 
 coreconfigitem = getitemregister(coreitems)
 
+coreconfigitem('auth', 'cookiefile',
+    default=None,
+)
 coreconfigitem('color', 'mode',
     default='auto',
 )