diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -2415,7 +2415,7 @@
 
 @command('grep',
     [('0', 'print0', None, _('end fields with NUL')),
-    ('', 'all', None, _('print all revisions that match')),
+    ('', 'all', None, _('print all revisions that match (DEPRECATED)')),
     ('', 'diff', None, _('print all revisions when the term was introduced or removed')),
     ('a', 'text', None, _('treat all files as text')),
     ('f', 'follow', None,