--- a/hgext3rd/topic/stack.py	Mon Mar 14 18:39:19 2016 +0000
+++ b/hgext3rd/topic/stack.py	Mon Mar 14 18:40:00 2016 +0000
@@ -20,7 +20,7 @@
         raise error.Abort(_('no active topic to list'))
     for idx, r in enumerate(getstack(repo, topic)):
         # super crude initial version
-        l = "%d: %s\n" % (idx, repo[r].description().splitlines()[0])
+        l = "t%d: %s\n" % (idx, repo[r].description().splitlines()[0])
         ui.write(l)
 
 # Copied from evolve 081605c2e9b6