diff -r bd3cb917761a -r 2406dbba49bd mercurial/commands.py
--- a/mercurial/commands.py	Fri Mar 31 23:00:41 2017 -0400
+++ b/mercurial/commands.py	Sat Apr 15 18:05:40 2017 -0400
@@ -4619,7 +4619,8 @@
     ('t', 'templates', '', _('web templates to use'), _('TEMPLATE')),
     ('', 'style', '', _('template style to use'), _('STYLE')),
     ('6', 'ipv6', None, _('use IPv6 in addition to IPv4')),
-    ('', 'certificate', '', _('SSL certificate file'), _('FILE'))],
+    ('', 'certificate', '', _('SSL certificate file'), _('FILE'))]
+     + subrepoopts,
     _('[OPTION]...'),
     optionalrepo=True)
 def serve(ui, repo, **opts):