diff --git a/core/modules/system/lib/Drupal/system/Tests/Entity/EntityOperationsTest.php b/core/modules/system/lib/Drupal/system/Tests/Entity/EntityOperationsTest.php
index a9c5319..2d142ca 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Entity/EntityOperationsTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Entity/EntityOperationsTest.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\system\Tests\Entity\EntityOperationsTest.
+ * Contains \Drupal\system\Tests\Entity\EntityOperationsTest.
  */
 
 namespace Drupal\system\Tests\Entity;
@@ -10,7 +10,7 @@
 use Drupal\simpletest\WebTestBase;
 
 /**
- * Tests for entity operations.
+ * Tests for entity operations, that they can be altered.
  */
 class EntityOperationsTest extends WebTestBase {
 
@@ -40,7 +40,9 @@ public function setUp() {
   }
 
   /**
-   * Check hook_entity_operation_alter hook is executed.
+   * Checks that hook_entity_operation_alter() can add an operation.
+   *
+   * @see entity_test_entity_operation_alter()
    */
   public function testEntityOperationAlter() {
     // Check that role listing contain our test_operation operation.
@@ -52,4 +54,5 @@ public function testEntityOperationAlter() {
       $this->assertLink('Test Operation: ' . $role->label());
     }
   }
+
 }
diff --git a/core/modules/system/tests/modules/entity_test/entity_test.module b/core/modules/system/tests/modules/entity_test/entity_test.module
index 4a39f90..d0e8d54 100644
--- a/core/modules/system/tests/modules/entity_test/entity_test.module
+++ b/core/modules/system/tests/modules/entity_test/entity_test.module
@@ -381,7 +381,7 @@ function entity_test_entity_form_display_alter(EntityFormDisplay $form_display,
 }
 
 /**
- * Implements hook_entity_presave().
+ * Implements hook_entity_presave()
  */
 function entity_test_entity_presave(EntityInterface $entity) {
   if (isset($GLOBALS['entity_test_throw_exception'])) {
@@ -390,7 +390,7 @@ function entity_test_entity_presave(EntityInterface $entity) {
 }
 
 /**
- * Implements hook_entity_predelete().
+ * Implements hook_entity_predelete()
  */
 function entity_test_entity_predelete(EntityInterface $entity) {
   if (isset($GLOBALS['entity_test_throw_exception'])) {
@@ -408,4 +408,4 @@ function entity_test_entity_operation_alter(array &$operations, EntityInterface
     'href' => $uri['path'] . '/test_operation',
     'weight' => 50,
   );
-}
\ No newline at end of file
+}