diff -r 421fdf30c37c -r f6540aba8e3e mercurial/subrepo.py
--- a/mercurial/subrepo.py	Mon Jun 24 16:00:39 2019 -0700
+++ b/mercurial/subrepo.py	Mon Jun 24 16:01:01 2019 -0700
@@ -88,13 +88,15 @@
 def _updateprompt(ui, sub, dirty, local, remote):
     if dirty:
         msg = (_(' subrepository sources for %s differ\n'
-                 'use (l)ocal source (%s) or (r)emote source (%s)?'
+                 'you can use (l)ocal source (%s) or (r)emote source (%s).\n'
+                 'what do you want to do?'
                  '$$ &Local $$ &Remote')
                % (subrelpath(sub), local, remote))
     else:
         msg = (_(' subrepository sources for %s differ (in checked out '
                  'version)\n'
-                 'use (l)ocal source (%s) or (r)emote source (%s)?'
+                 'you can use (l)ocal source (%s) or (r)emote source (%s).\n'
+                 'what do you want to do?'
                  '$$ &Local $$ &Remote')
                % (subrelpath(sub), local, remote))
     return ui.promptchoice(msg, 0)