diff --git a/core/modules/simpletest/lib/Drupal/simpletest/DrupalUnitTestBase.php b/core/modules/simpletest/lib/Drupal/simpletest/DrupalUnitTestBase.php
index f1586cc..a7dd70d 100644
--- a/core/modules/simpletest/lib/Drupal/simpletest/DrupalUnitTestBase.php
+++ b/core/modules/simpletest/lib/Drupal/simpletest/DrupalUnitTestBase.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\simpletest\DrupalUnitTestBase.
+ * Contains Drupal\simpletest\DrupalUnitTestBase.
  */
 
 namespace Drupal\simpletest;
@@ -20,6 +20,7 @@
  * Additional modules needed in a test may be loaded and added to the fixed
  * module list.
  *
+ * @see DrupalUnitTestBase::$modules
  * @see DrupalUnitTestBase::enableModules()
  *
  * By installing the {system} schema, modules may be fully installed, too.
@@ -55,12 +56,13 @@
   private $moduleList = array();
 
   /**
-   * Sets up unit test environment.
+   * Sets up Drupal unit test environment.
    *
-   * Unlike Drupal\simpletest\WebTestBase::setUp(), UnitTestBase::setUp() does not
-   * install modules because tests are performed without accessing the database.
-   * Any required files must be explicitly included by the child class setUp()
-   * method.
+   * Unlike UnitTestBase::setUp(), any modules specified in the $modules
+   * property are automatically loaded and set as the fixed module list.
+   *
+   * @see DrupalUnitTestBase::$modules
+   * @see DrupalUnitTestBase
    */
   protected function setUp() {
     parent::setUp();