Issue #3332145: hook_help function missing in .module file

config_distro.module

@@ -5,6 +5,40 @@
  * Framework for managing configuration updates from distributions.
  */
 
+use Drupal\Core\Link;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Url;
+
+/**
+ * Implements hook_help().
+ */
+function config_distro_help($route_name, RouteMatchInterface $route_match) {
+  switch ($route_name) {
+    // Main module help for the 'Config Distro' module.
+    case 'help.page.config_distro':
+      $output = '<h3>' . t('Usage') . '</h3>';
+
+      $output .= '<p>' . t('To use this module you should install one or more
+       modules that provide Config Filter plugins that integrate with this
+       module, such as Configuration Synchronizer.') . '</p>';
+
+      $output .= '<p>' . t('Update your installed modules or themes to new
+       versions that include configuration changes or updates. Run database
+       updates and clear caches.') . '</p>';
+
+      // Using Drupal's Url and Link classes for internal paths.
+      $distroUpdateUrl = Url::fromRoute('config_distro.import');
+      $distroUpdateLink = Link::fromTextAndUrl(t('Distribution Update'), $distroUpdateUrl)->toString();
+
+      $output .= '<p>' . t('If using the UI, navigate to Configuration >
+       Development > !distroUpdateLink (/admin/config/development/distro). Review and run updates', ['!distroUpdateLink' => $distroUpdateLink]) . '</p>';
+
+      $output .= '<p>' . t('If using Drush, use the Drush command config-distro-update to run imports.') . '</p>';
+
+      return $output;
+  }
+}
+
 /**
  * Implements hook_batch_alter().
  *