diff -r 0d119802242b -r 453bc6ca9ab2 mercurial/commands.py
--- a/mercurial/commands.py	Thu Sep 17 15:34:13 2020 +0200
+++ b/mercurial/commands.py	Thu Sep 10 13:10:53 2020 +0900
@@ -3252,7 +3252,7 @@
     b'grep',
     [
         (b'0', b'print0', None, _(b'end fields with NUL')),
-        (b'', b'all', None, _(b'print all revisions that match (DEPRECATED) ')),
+        (b'', b'all', None, _(b'an alias to --diff (DEPRECATED)')),
         (
             b'',
             b'diff',