diff --git a/core/modules/help/lib/Drupal/help/Controller/HelpController.php b/core/modules/help/lib/Drupal/help/Controller/HelpController.php
index c020b51..394fdf9 100644
--- a/core/modules/help/lib/Drupal/help/Controller/HelpController.php
+++ b/core/modules/help/lib/Drupal/help/Controller/HelpController.php
@@ -16,14 +16,17 @@
 class HelpController implements ControllerInterface {
 
   /**
-   * Stores the Module handler.
+   * Stores the module handler.
    *
    * @var \Drupal\Core\Extension\ModuleHandler
    */
   protected $moduleHandler;
 
   /**
-   * Constructs a HelpController object.
+   * Constructs a \Drupal\help\Controller\HelpController object.
+   *
+   * @param \Drupal\Core\Extension\ModuleHandler $module_handler
+   *   The module handler.
    */
   public function __construct(ModuleHandler $module_handler) {
     $this->moduleHandler = $module_handler;
@@ -38,6 +41,9 @@ public static function create(ContainerInterface $container) {
 
   /**
    * Prints a page listing a glossary of Drupal terminology.
+   *
+   * @return string
+   *   An HTML string representing the contents of help page.
    */
   public function helpMain() {
     // Add CSS.
@@ -49,7 +55,7 @@ public function helpMain() {
   /**
    * Provides a formatted list of available help topics.
    *
-   * @return
+   * @return string
    *   A string containing the formatted list.
    */
   private function helpLinksAsList() {
@@ -80,4 +86,5 @@ private function helpLinksAsList() {
 
     return $output;
   }
+
 }