diff --git a/_gtfobins/check_by_ssh.md b/_gtfobins/check_by_ssh.md
index 5660689..0f5e7da 100644
--- a/_gtfobins/check_by_ssh.md
+++ b/_gtfobins/check_by_ssh.md
@@ -1,6 +1,12 @@
 ---
 description: |
   This is the `check_by_ssh` Nagios plugin, available e.g. in `/usr/lib/nagios/plugins/`.
+
+  When `check_by_ssh` version `2.4.5` (2023-05-31) or later from the Nagios
+  Plugins project in it's default configuration is used, it does not work anymore.
+
+  It does still work on previous versions from the Nagios Plugins project or
+  all versions from the Monitoring Project (e.g. used by Ubuntu/Debian).
 functions:
   shell:
     - description: The shell will only last 10 seconds.