diff --git a/ssh2.h b/ssh2.h
index 0d48d0527..836eeda7c 100644
--- a/ssh2.h
+++ b/ssh2.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssh2.h,v 1.21 2023/08/28 03:28:43 djm Exp $ */
+/* $OpenBSD: ssh2.h,v 1.22 2023/10/10 03:57:45 djm Exp $ */
 
 /*
  * Copyright (c) 2000 Markus Friedl.  All rights reserved.
@@ -53,6 +53,7 @@
  *   Local extensions:
  *
  *     192-255  Local extensions
+ *     248-255  Local extensions (OpenSSH will never use numbers in this range)
  */
 
 /* special marker for no message */