express-8.x-1.x-dev/modules/custom/express_site_info/express_site_info.module

<?php

/**
 * @file
 * Site info.
 */

use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function express_site_info_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.express_site_info':
      $output = '<h3>' . t('About Express Site Info') . '</h3>';
      $output .= '<p>' . t('This module displays your contact information via a block.') . '</p>';
      return $output;
  }
}