diff --git a/_observing-your-data/notifications/index.md b/_observing-your-data/notifications/index.md
index db655d32..b352988c 100644
--- a/_observing-your-data/notifications/index.md
+++ b/_observing-your-data/notifications/index.md
@@ -100,6 +100,9 @@ Then add this policy into the IAM user’s trust relationship to actually assume
 }
 ```
 
+### Host deny list
+
+Define IP ranges or hostnames where OpenSearch nodes should not initiate requests. 
 
 ## Email as a channel type