diff --git a/docs/alerting/alerting.md b/docs/alerting/alerting.md
index 64b4fa5935..6c1d6f5f6c 100644
--- a/docs/alerting/alerting.md
+++ b/docs/alerting/alerting.md
@@ -23,6 +23,7 @@ Currently **SMTP** is the **only supported delivery mechanism** for notification
 
 ```
 ENABLE_ALERTING=true
+ALERT_SENDER=sender@yourmail.com
 ALERT_RECIPIENT=recipient@yourmail.com
 
 SMTP_SERVER=your.smtp-server.com