diff --git a/ui-ngx/src/assets/locale/locale.constant-en_US.json b/ui-ngx/src/assets/locale/locale.constant-en_US.json
index 9275adcb6a..27e504d6ee 100644
--- a/ui-ngx/src/assets/locale/locale.constant-en_US.json
+++ b/ui-ngx/src/assets/locale/locale.constant-en_US.json
@@ -909,7 +909,7 @@
         "edit-alarm-rule": "Edit alarm rule",
         "alarm-type": "Alarm type",
         "alarm-type-required": "Alarm type is required.",
-        "alarm-type-unique": "Alarm type needs to be unique.",
+        "alarm-type-unique": "Alarm type must be unique within the device profile alarm rules.",
         "alarm-type-pattern-hint": "Alarm type pattern, use <code>${metaKeyName}</code> to substitute variables from metadata",
         "create-alarm-pattern": "Create <b>{{alarmType}}</b> alarm",
         "create-alarm-rules": "Create alarm rules",