diff --git a/schema_clusters.json b/schema_clusters.json
index 9c11e4d..914d065 100644
--- a/schema_clusters.json
+++ b/schema_clusters.json
@@ -40,8 +40,11 @@
             "type": "string"
           },
           "related": {
-            "type": "object",
+            "type": "array",
             "additionalProperties": false,
+            "items": {
+              "type": "object"
+            },
             "properties": {
               "dest-uuid": {
                 "type": "string"