diff -r 48637f926817 -r bd2ed1032b4e mercurial/debugcommands.py
--- a/mercurial/debugcommands.py	Mon May 03 22:53:02 2021 +0530
+++ b/mercurial/debugcommands.py	Tue May 04 13:28:42 2021 -0400
@@ -4085,7 +4085,7 @@
     should complete almost instantaneously and the chances of a consumer being
     unable to access the repository should be low.
 
-    By default, all revlog will be upgraded. You can restrict this using flag
+    By default, all revlogs will be upgraded. You can restrict this using flags
     such as `--manifest`:
 
       * `--manifest`: only optimize the manifest