diff -r 2c9f15366982 -r 704818fb170d mercurial/wireproto.py
--- a/mercurial/wireproto.py	Tue Oct 13 14:55:02 2015 -0700
+++ b/mercurial/wireproto.py	Wed Oct 14 10:36:20 2015 -0700
@@ -160,7 +160,8 @@
              'obsmarkers': 'boolean',
              'bundlecaps': 'scsv',
              'listkeys': 'csv',
-             'cg': 'boolean'}
+             'cg': 'boolean',
+             'cbattempted': 'boolean'}
 
 # client side