diff --git a/help/start.txt b/help/start.txt
index ab18a230..84b642da 100644
--- a/help/start.txt
+++ b/help/start.txt
@@ -52,6 +52,12 @@ OPTS
   -g, --close-grace-delay
       The maximum amount of time before forcefully closing pending requests (default to 500 ms)
 
+  -d, --debug
+      Start Fastify app in debug mode with nodejs inspector 
+
+  -I, --debug-port
+      Set the inspector port (default to 9320)
+
   -h, --help
       Show this help message