diff --git a/HowtoTomcat.md b/HowtoTomcat.md
index 54b54dda..ac542700 100644
--- a/HowtoTomcat.md
+++ b/HowtoTomcat.md
@@ -327,10 +327,16 @@ Voici un VirtualHost type :
 
 ### Nagios
 
-Vérification simple :
+Vérification simple du port HTTP :
 
 ~~~
-$ /usr/lib/nagios/plugins/check_tcp -H 127.0.0.1 -p 8080
+$ /usr/lib/nagios/plugins/check_http -H 127.0.0.1 -p 8080
+~~~
+
+Vérification simple du port AJP :
+
+~~~
+$ /usr/lib/nagios/plugins/check_tcp -H 127.0.0.1 -p 8009
 ~~~
 
 ## FAQ