diff --git a/examples.module b/examples.module
index 1b764d6..f09110b 100644
--- a/examples.module
+++ b/examples.module
@@ -51,6 +51,7 @@ function examples_toolbar() {
     'plugin_type_example' => 'plugin_type_example.description',
     'simpletest_example' => 'simpletest_example_description',
     'tour_example' => 'tour_example_description',
+    'vertical_tabs_example' => 'vertical_tabs_example.description',
   );
 
   // Build a list of links for the menu.
diff --git a/vertical_tabs_example/src/Controller/VerticalTabsExampleController.php b/vertical_tabs_example/src/Controller/VerticalTabsExampleController.php
index fba58e3..5ba8b0a 100644
--- a/vertical_tabs_example/src/Controller/VerticalTabsExampleController.php
+++ b/vertical_tabs_example/src/Controller/VerticalTabsExampleController.php
@@ -10,25 +10,29 @@ namespace Drupal\vertical_tabs_example\Controller;
 use Drupal\Core\Url;
 
 /**
- * Class VerticalTabsExampleController
+ * Class VerticalTabsExampleController.
+ *
  * @package Drupal\vertical_tabs_example\Controller
  */
 class VerticalTabsExampleController {
+
   /**
    * A simple controller method to explain the vertical tabs example.
    */
   public function description() {
     $url = Url::fromRoute('node.add_page');
-    $content_add = \Drupal::l(t('content_add'), $url);
+    $content_add = \Drupal::l(t('add a piece of content'), $url);
     $build = array(
       '#markup' => t('The Vertical Tabs Example shows how a
         custom module can add a vertical tab to a node edit form,
         and support its summary field with JavaScript. To see the
-        effects of this module, !content_add and look at the set
-        of tabs at the bottom. We\'ve added one called \'Example vertical tab.\'',
-        array('!content_add' => $content_add)
+        effects of this module, !add a piece of content and look at the set
+        of tabs beside. We\'ve added one called \'Example vertical tab.\'',
+        array('!add a piece of content' => $content_add)
       ),
     );
     return $build;
+
   }
+
 }
diff --git a/vertical_tabs_example/src/Tests/VerticalTabsExampleTest.php b/vertical_tabs_example/src/Tests/VerticalTabsExampleTest.php
index bf931ab..197ce5e 100644
--- a/vertical_tabs_example/src/Tests/VerticalTabsExampleTest.php
+++ b/vertical_tabs_example/src/Tests/VerticalTabsExampleTest.php
@@ -15,6 +15,7 @@ use Drupal\simpletest\WebTestBase;
  * Functional tests for the Vertical Tabs Example module.
  *
  * @ingroup vertical_tabs_examples
+ *
  * @group vertical_tabs_examples
  * @group examples
  */
@@ -30,12 +31,15 @@ class VerticalTabsExampleTest extends WebTestBase {
    * Tests the menu paths defined in vertical_tabs_example module.
    */
   public function testVerticalTabsExampleMenus() {
-    $paths = array(
-      'examples/vertical_tabs',
-    );
-    foreach ($paths as $path) {
-      $this->drupalGet($path);
-      $this->assertResponse(200, '200 response for path: ' . $path);
-    }
+    // Verify links on front-page.
+    $this->drupalGet('examples/vertical_tabs');
+    $this->assertResponse(200, '200 response for path: ' . $path);
+    $this->assertLinkByHref('node/add');
+    // Verify vertical tab on node/add/article.
+    $this->drupalGet('node/add');
+    $this->clickLink('Article');
+    $this->assertFieldByXPath("//details[@id='edit-vertical-tabs-example']");
+
   }
+
 }
diff --git a/vertical_tabs_example/vertical_tabs_example.libraries.yml b/vertical_tabs_example/vertical_tabs_example.libraries.yml
index 4a7d536..d665e15 100644
--- a/vertical_tabs_example/vertical_tabs_example.libraries.yml
+++ b/vertical_tabs_example/vertical_tabs_example.libraries.yml
@@ -1,5 +1,7 @@
+# Build up our dependencies as a library.
 vertical_tabs_example:
   version: 1.x
+  # Adding our js file.
   js:
     js/vertical_tabs_example.js: {}
   dependencies: