diff --git a/src/MDConcMeasurementTypes.php b/src/MDConcMeasurementTypes.php
index f12756c..587324b 100644
--- a/src/MDConcMeasurementTypes.php
+++ b/src/MDConcMeasurementTypes.php
@@ -4704,6 +4704,7 @@ final class MDConcMeasurementTypes implements MDImporterConcordanceListInterface
             'Durchmesser (Flasche)',
             'Durchmesser (Haken)',
             'Durchmesser (Oberkante)',
+            'Durchmesser (Ring)',
             'Durchmesser (S 8673/1 in Hülle)',
             'Durchmesser (S 8799/b)',
             'Durchmesser (S 8802/1-4)',