diff --git a/lib/qa/authorities/loc_subauthority.rb b/lib/qa/authorities/loc_subauthority.rb
index 76c3411..e66ce38 100644
--- a/lib/qa/authorities/loc_subauthority.rb
+++ b/lib/qa/authorities/loc_subauthority.rb
@@ -43,6 +43,7 @@ def vocabularies # rubocop:disable Metrics/MethodLength
       "frequencies",
       "geographicAreas",
       "graphicMaterials",
+      "identifiers",
       "iso639-1",
       "iso639-2",
       "iso639-5",