--- a/hgext3rd/topic/__init__.py	Sun Dec 02 16:52:14 2018 +0100
+++ b/hgext3rd/topic/__init__.py	Fri Sep 21 11:44:34 2018 -0400
@@ -721,6 +721,8 @@
     return ret
 
 @command('stack', [
+        ('c', 'children', None,
+            _('display data about children outside of the stack'))
     ] + commands.formatteropts,
     _('hg stack [TOPIC]'))
 def cmdstack(ui, repo, topic='', **opts):