diff --git a/src/MDConcObjectTagRelTypes.php b/src/MDConcObjectTagRelTypes.php
index dad7d1e..533c01d 100644
--- a/src/MDConcObjectTagRelTypes.php
+++ b/src/MDConcObjectTagRelTypes.php
@@ -37,11 +37,13 @@ final class MDConcObjectTagRelTypes implements MDImporterConcordanceListInterfac
 
         'Objektart' => 'object_type',
         'objektart' => 'object_type',
+        'object_type' => 'object_type',
 
         "motive" => "display_subject",
         "motiv" => "display_subject",
         "display" => "display_subject",
         "Bildelement" => "display_subject",
+        "display_subject" => "display_subject",
 
         "material" => "material",