diff --git a/modules/monitoring-expiring-silences.adoc b/modules/monitoring-expiring-silences.adoc
index 069a41f4a917..b23c60bdaa5d 100644
--- a/modules/monitoring-expiring-silences.adoc
+++ b/modules/monitoring-expiring-silences.adoc
@@ -8,6 +8,12 @@
 
 You can expire a silence. Expiring a silence deactivates it forever.
 
+[NOTE]
+====
+You cannot delete expired, silenced alerts.
+Expired silences older than 120 hours are garbage collected.
+====
+
 .Procedure
 
 To expire a silence in the *Administrator* perspective: