--- a/hgext/strip.py	Sun Oct 14 11:16:22 2018 -0400
+++ b/hgext/strip.py	Wed Oct 17 21:00:36 2018 +0800
@@ -110,7 +110,7 @@
           ('k', 'keep', None, _("do not modify working directory during "
                                 "strip")),
           ('B', 'bookmark', [], _("remove revs only reachable from given"
-                                  " bookmark"))],
+                                  " bookmark"), _('BOOKMARK'))],
           _('hg strip [-k] [-f] [-B bookmark] [-r] REV...'),
           helpcategory=command.CATEGORY_MAINTENANCE)
 def stripcmd(ui, repo, *revs, **opts):