diff --git a/ramls/instance.json b/ramls/instance.json
index 24edaa73a..5ce12a25e 100644
--- a/ramls/instance.json
+++ b/ramls/instance.json
@@ -214,6 +214,16 @@
             "type": "string",
             "description": "UUID of authority record that controls a subject heading",
             "$ref": "uuid.json"
+          },
+          "sourceId": {
+            "type": "string",
+            "description": "UUID of subject source",
+            "$ref": "uuid.json"
+          },
+          "typeId": {
+            "type": "string",
+            "description": "UUID of subject type",
+            "$ref": "uuid.json"
           }
         },
         "additionalProperties": false,