diff --git a/json-schemas/src/attachments.json b/json-schemas/src/attachments.json
index 0dd717c..6360969 100644
--- a/json-schemas/src/attachments.json
+++ b/json-schemas/src/attachments.json
@@ -54,7 +54,8 @@
             "metrics.subscribers",
             "metrics.presenceConnections",
             "metrics.presenceMembers",
-            "metrics.presenceSubscribers"
+            "metrics.presenceSubscribers",
+            "metrics.stateSubscribers"
           ]
         }
       }