--- a/hgext3rd/topic/stack.py	Fri Apr 01 16:57:11 2016 -0700
+++ b/hgext3rd/topic/stack.py	Fri Apr 01 16:58:52 2016 -0700
@@ -35,7 +35,7 @@
     # super crude initial version
     for idx, ctx in entries[::-1]:
         if idx is None:
-            symbol = '_'
+            symbol = '^'
             state = 'base'
         elif repo.revs('%d and parents()', ctx.rev()):
             symbol = '@'