diff --git a/doc/03-monitoring-basics.md b/doc/03-monitoring-basics.md
index 5dd53c5ce..b3b63e9bc 100644
--- a/doc/03-monitoring-basics.md
+++ b/doc/03-monitoring-basics.md
@@ -1603,6 +1603,7 @@ configuration files.
 
 A quick-fix is shown below:
 
+```
 @@ -5,7 +5,8 @@ object NotificationCommand "mail-host-notification" {
 
    env = {