diff --git a/core/modules/user/lib/Drupal/user/Tests/UserUsernameTest.php b/core/modules/user/lib/Drupal/user/Tests/UserUsernameTest.php
index 1b027de..c01b829 100644
--- a/core/modules/user/lib/Drupal/user/Tests/UserUsernameTest.php
+++ b/core/modules/user/lib/Drupal/user/Tests/UserUsernameTest.php
@@ -26,10 +26,23 @@ class UserUsernameTest extends WebTestBase {
     'user_test_views'
   );
 
+  /**
+   * The user with the shorter username.
+   *
+   * @var \Drupal\user\Entity\User
+   */
   protected $userShortName;
 
+  /**
+   * The user with the longer short username.
+   *
+   * @var \Drupal\user\Entity\User
+   */
   protected $userLongName;
 
+  /**
+   * {@inheritdoc}
+   */
   public static function getInfo() {
     return array(
       'name' => 'Username functionality',
@@ -38,6 +51,9 @@ public static function getInfo() {
     );
   }
 
+  /**
+   * {@inheritdoc}
+   */
   public function setUp() {
     parent::setUp();