--- a/mercurial/obsolete.py Tue Oct 14 13:25:13 2014 -0700
+++ b/mercurial/obsolete.py Tue Oct 14 13:26:01 2014 -0700
@@ -84,6 +84,7 @@
# Options for obsolescence
createmarkersopt = 'createmarkers'
allowunstableopt = 'allowunstable'
+exchangeopt = 'exchange'
### obsolescence marker flag