diff --git a/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/stable/2021-06-01/Clusters.json b/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/stable/2021-06-01/Clusters.json
index d4f1dbfc0ec0..f8c56df74cca 100644
--- a/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/stable/2021-06-01/Clusters.json
+++ b/specification/operationalinsights/resource-manager/Microsoft.OperationalInsights/stable/2021-06-01/Clusters.json
@@ -635,10 +635,11 @@
         },
         "capacityReservationLevel": {
           "readOnly": true,
-          "description": "The capacity reservation level for this cluster",
+          "description": "The capacity reservation level for this cluster in GB",
           "type": "integer",
           "format": "int32",
           "enum": [
+            500,
             1000,
             2000,
             5000