diff -r bb8278b289ee -r 6c86c673dde6 mercurial/obsolete.py
--- a/mercurial/obsolete.py	Tue Oct 14 13:20:31 2014 -0700
+++ b/mercurial/obsolete.py	Tue Oct 14 13:23:52 2014 -0700
@@ -81,6 +81,9 @@
 # you have to rely on third party extension extension to enable this.
 _enabled = False
 
+# Options for obsolescence
+createmarkersopt = 'createmarkers'
+
 ### obsolescence marker flag
 
 ## bumpedfix flag