--- a/README	Mon Jun 19 02:50:35 2017 +0530
+++ b/README	Mon Jun 19 03:13:35 2017 +0530
@@ -125,6 +125,7 @@
 -------------------
 
  - stack: also show the unstable status for the current changeset (issue5553)
+ - stack: properly abort when and unknown topic is requested,
  - topic: fix issue5441 in the linear case,
 
 6.4.0 -- 2017-06-16