--- a/hgext3rd/topic/stack.py	Mon Dec 04 17:16:01 2017 +0530
+++ b/hgext3rd/topic/stack.py	Mon Dec 04 14:27:27 2017 -0800
@@ -262,7 +262,7 @@
     else:
         if data['behindcount'] == -1:
             fm.plain(', ')
-            fm.plain('ambigious rebase destination - %s' % data['behinderror'],
+            fm.plain('ambiguous rebase destination - %s' % data['behinderror'],
                      label='topic.stack.summary.behinderror')
         elif data['behindcount']:
             fm.plain(', ')