diff --git a/core/tests/Drupal/KernelTests/Core/Entity/EntityOriginalRevisionTest.php b/core/tests/Drupal/KernelTests/Core/Entity/EntityOriginalRevisionTest.php
index 1694dad..9e15d78 100644
--- a/core/tests/Drupal/KernelTests/Core/Entity/EntityOriginalRevisionTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Entity/EntityOriginalRevisionTest.php
@@ -28,7 +28,11 @@ protected function setUp() {
 
   }
 
-  public function testPreviousProperty() {
+  /**
+   * Tests the original revision id is set and returned at the right point in
+   * the entity process.
+   */
+  public function testOriginalRevisionId() {
     // Create a basic EntityTestMulRev entity and save it.
     $entity = EntityTestMulRev::create();
     $entity->save();
@@ -37,17 +41,17 @@ public function testPreviousProperty() {
     $loaded = EntityTestMulRev::load($entity->id());
     $loaded->setNewRevision(TRUE);
 
-    // Before saving the original revision ID should be the same as the created
-    // entity, not the same as the loaded entity (which won't have a revision id
-    // yet).
+    // Before saving, the original revision ID should be the same as the created
+    // entity, not the same as the loaded entity (which do not have a revision
+    // id yet).
     $this->assertEquals($entity->getRevisionId(), $loaded->getOriginalRevisionId());
     $this->assertNotEquals($loaded->getRevisionId(), $loaded->getOriginalRevisionId());
-    $this->assertTrue($loaded->getRevisionId() === NULL);
+    $this->assertSame(NULL, $loaded->getRevisionId());
 
     $loaded->save();
 
-    // In hook_update the original revision id was stored in state. This should
-    // be the same as we had before calling $loaded->save().
+    // In entity_test_update the original revision id was stored in state. This
+    // should be the same as we had before calling $loaded->save().
     /** @var \Drupal\Core\Entity\ContentEntityInterface $loaded_original */
     $originalRevisionId = \Drupal::state()->get('entity_test.originalRevisionId');
     $this->assertEquals($entity->getRevisionId(), $originalRevisionId);
@@ -68,8 +72,9 @@ public function testPreviousProperty() {
 
     $loaded->save();
 
-    // After saving the original revision id set in hook_update, and returned
-    // from the entity should be the same and the entity's revision id.
+    // After saving, the original revision id set in entity_test and returned
+    // from the entity should be the same and the entity's revision id because
+    // a new revision wasn't created, the existing revision was updated.
     $originalRevisionId2 = \Drupal::state()->get('entity_test.originalRevisionId');
     $this->assertEquals($loaded->getRevisionId(), $originalRevisionId2);
     $this->assertEquals($loaded->getRevisionId(), $loaded->getOriginalRevisionId());