diff --git a/json-schema/job-metric-data.schema.json b/json-schema/job-metric-data.schema.json
index 96017b1..06dac01 100644
--- a/json-schema/job-metric-data.schema.json
+++ b/json-schema/job-metric-data.schema.json
@@ -11,7 +11,8 @@
         },
         "scope": {
             "description": "",
-            "type": "string"
+            "type": "string",
+            "enum": [ "node", "cpu", "socket" ]
         },
         "timestep": {
             "description": "",