diff --git a/src/things/catalog.ts b/src/things/catalog.ts
index bd0a6d53..26ad63e1 100644
--- a/src/things/catalog.ts
+++ b/src/things/catalog.ts
@@ -33,6 +33,7 @@ export interface SCCatalogWithoutReferences
    *
    * Needed for keeping order in catalog inheritance array.
    *
+   * @filterable
    * @integer
    */
   level: number;