diff --git a/core/modules/action/lib/Drupal/action/Controller/ActionController.php b/core/modules/action/lib/Drupal/action/Controller/ActionController.php
index 8a05443..e4b5d92 100644
--- a/core/modules/action/lib/Drupal/action/Controller/ActionController.php
+++ b/core/modules/action/lib/Drupal/action/Controller/ActionController.php
@@ -13,8 +13,16 @@
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\RedirectResponse;
 
+/**
+ * Controller providing page callbacks for the action admin interface.
+ */
 class ActionController implements ControllerInterface {
 
+  /**
+   * The database connection object for this controller.
+   *
+   * @var \Drupal\Core\Database\Connection
+   */
   protected $database;
 
   /**
@@ -24,6 +32,11 @@ public static function create(ContainerInterface $container) {
     return new static($container->get('database'));
   }
 
+  /**
+   * Constructs a new ActionController.
+   *
+   * @param \Drupal\Core\Database\Connection $database
+   */
   public function __construct(Connection $database) {
     $this->database = $database;
   }