diff -r 0e2becd1fe0c -r 3e3b81b6e7da mercurial/debugcommands.py
--- a/mercurial/debugcommands.py	Fri Jan 29 15:51:00 2021 -0800
+++ b/mercurial/debugcommands.py	Mon Jan 25 14:23:47 2021 +0530
@@ -2212,9 +2212,9 @@
             b'',
             b'dump-new',
             False,
-            _(b'write a (new) persistent binary nodemap on stdin'),
+            _(b'write a (new) persistent binary nodemap on stdout'),
         ),
-        (b'', b'dump-disk', False, _(b'dump on-disk data on stdin')),
+        (b'', b'dump-disk', False, _(b'dump on-disk data on stdout')),
         (
             b'',
             b'check',