diff -up openssh-9.9p1/ssh_config.5.xxx openssh-9.9p1/ssh_config.5
--- openssh-9.9p1/ssh_config.5.xxx	2024-10-11 12:01:14.260566303 +0200
+++ openssh-9.9p1/ssh_config.5	2024-10-11 12:01:59.725654775 +0200
@@ -759,7 +759,7 @@ or
 This option should be placed in the non-hostspecific section.
 See
 .Xr ssh-keysign 8
-for more information.
+for more information. ssh-keysign should be installed explicitly.
 .It Cm EscapeChar
 Sets the escape character (default:
 .Ql ~ ) .