diff -r d71693f799a0 -r 5178dd2233d0 mercurial/commands.py
--- a/mercurial/commands.py	Fri Jul 24 15:03:14 2020 -0700
+++ b/mercurial/commands.py	Tue Jul 28 09:58:28 2020 -0700
@@ -5781,6 +5781,13 @@
     [
         (b'A', b'after', None, _(b'record a rename that has already occurred')),
         (
+            b'',
+            b'at-rev',
+            b'',
+            _(b'(un)mark renames in the given revision (EXPERIMENTAL)'),
+            _(b'REV'),
+        ),
+        (
             b'f',
             b'force',
             None,