diff --git a/core/modules/taxonomy/src/Tests/TaxonomyTestTrait.php b/core/modules/taxonomy/src/Tests/TaxonomyTestTrait.php
index f04be00..f0e3d28 100644
--- a/core/modules/taxonomy/src/Tests/TaxonomyTestTrait.php
+++ b/core/modules/taxonomy/src/Tests/TaxonomyTestTrait.php
@@ -14,6 +14,9 @@
 
   /**
    * Returns a new vocabulary with random properties.
+   *
+   * @return \Drupal\taxonomy\Entity\Vocabulary
+   *   The new taxonomy vocabulary object.
    */
   function createVocabulary() {
     // Create a vocabulary.