--- a/README	Mon Jun 02 14:58:45 2014 -0700
+++ b/README	Tue Jun 03 01:16:39 2014 -0700
@@ -49,6 +49,7 @@
 
 4.0.0 --
 
+- require Mercurial version 3.0.1 or above
 - deprecated `gup` and `gdown` in favor of prev and next
 - record parent of pruned parent at prune time
 - added a `debugobsstorestat` command to gather data on obsmarker content.