diff --git a/tests/ConceptPropertyValueLiteralTest.php b/tests/ConceptPropertyValueLiteralTest.php
index a490ef7cd..db3e36299 100644
--- a/tests/ConceptPropertyValueLiteralTest.php
+++ b/tests/ConceptPropertyValueLiteralTest.php
@@ -218,6 +218,7 @@ public function testGetXlLabel() {
   /**
    * @covers ConceptPropertyValueLiteral::getXlLabel
    * @covers ConceptPropertyValueLiteral::hasXlProperties
+   * @covers LabelSkosXL::getLang
    */
   public function testGetXlPropertiesByLang() {
     $voc = $this->model->getVocabulary('xl');