diff --git a/src/Tests/DiffPluginTest.php b/src/Tests/DiffPluginTest.php
index 8109230..f428656 100644
--- a/src/Tests/DiffPluginTest.php
+++ b/src/Tests/DiffPluginTest.php
@@ -140,14 +140,14 @@ class DiffPluginTest extends WebTestBase {
   /**
    * Tests a field without plugins.
    */
-  public function testNoPlugin() {
+  public function testFieldWithNoPlugin() {
     // Create an article.
     $node = $this->drupalCreateNode([
       'type' => 'article',
     ]);
 
-    // Edit the article and create a new revision. "Changed" field should be
-    // updated.
+    // Update the article and add a new revision, the "changed" field should be
+    // updated which does not have plugins provided by diff.
     $edit = array(
       'revision' => TRUE,
     );
@@ -156,6 +156,9 @@ class DiffPluginTest extends WebTestBase {
     // Check the difference between the last two revisions.
     $this->clickLink(t('Revisions'));
     $this->drupalPostForm(NULL, NULL, t('Compare'));
+
+    // "changed" field is not displayed since there is no plugin for it. This
+    // should not break the revisions comparison display.
     $this->assertResponse(200);
     $this->assertLink(t('Back to Revision Overview'));
     $this->assertLink(t('Standard'));