diff --git a/_im-plugin/ism/policies.md b/_im-plugin/ism/policies.md
index c35a49e2..a99a6f52 100644
--- a/_im-plugin/ism/policies.md
+++ b/_im-plugin/ism/policies.md
@@ -127,7 +127,7 @@ Parameter | Description | Type | Required
 
 ### read_only
 
-Sets a managed index to be read only.
+Sets a managed index to be read only. Read-only indexes don't refresh.
 
 ```json
 {