diff --git a/core/modules/user/lib/Drupal/user/Access/RoleAccessCheck.php b/core/modules/user/lib/Drupal/user/Access/RoleAccessCheck.php
index 3541168..5aa2800 100644
--- a/core/modules/user/lib/Drupal/user/Access/RoleAccessCheck.php
+++ b/core/modules/user/lib/Drupal/user/Access/RoleAccessCheck.php
@@ -12,7 +12,7 @@
 use Symfony\Component\Routing\Route;
 
 /**
- * Determines access to routes based on roles defined via hook_permission().
+ * Determines access to routes based on roles.
  */
 class RoleAccessCheck implements AccessCheckInterface {
 
@@ -39,6 +39,7 @@ public function access(Route $route, Request $request) {
     if (empty($diff)) {
       return TRUE;
     }
+    // If there is no allowed role, return NULL to give other checks a chance.
     else {
       return NULL;
     }
diff --git a/core/tests/Drupal/Tests/Core/Route/RouterRoleTest.php b/core/tests/Drupal/Tests/Core/Route/RouterRoleTest.php
index 9f9f73b..b593a1b 100644
--- a/core/tests/Drupal/Tests/Core/Route/RouterRoleTest.php
+++ b/core/tests/Drupal/Tests/Core/Route/RouterRoleTest.php
@@ -17,7 +17,8 @@
 use Symfony\Component\Routing\Route;
 use Symfony\Component\Routing\RouteCollection;
 
-// Needed because the Entity class calls it.
+// Needed because the Entity class uses this constant.
+// @todo Remove once http://drupal.org/node/1620010 is in.
 if (!defined('LANGUAGE_NOT_SPECIFIED')) {
   define('LANGUAGE_NOT_SPECIFIED', 'und');
 }
@@ -37,7 +38,7 @@ class RouterRoleTest extends UnitTestCase {
   public static function getInfo() {
     return array(
       'name' => 'Router Role tests',
-      'description' => 'Function Tests for the routing role system.',
+      'description' => 'Test for the role based access checker in the routing system.',
       'group' => 'Routing',
     );
   }
@@ -80,8 +81,10 @@ protected function getTestRouteCollection() {
 
   /**
    * Provides data for the role access test.
+   *
+   * @see \Drupal\Tests\Core\Route\RouterRoleTest::testRoleAccess
    */
-  public function testRoleAccessProvider() {
+  public function roleAccessProvider() {
     // Setup two different roles used in the test.
     $rid_1 = 'role_test_1';
     $rid_2 = 'role_test_2';
@@ -143,8 +146,9 @@ protected function accountsToDeny($grant_users) {
    *   A list of accounts which should have access to the given path.
    *
    * @see \Drupal\Tests\Core\Route\RouterRoleTest::getTestRouteCollection
+   * @see \Drupal\Tests\Core\Route\RouterRoleTest::roleAccessProvider
    *
-   * @dataProvider testRoleAccessProvider
+   * @dataProvider roleAccessProvider
    */
   public function testRoleAccess($path, $grant_accounts) {
     $role_access_check = new RoleAccessCheck();