pcb-8.x-2.2/modules/pcb_redis/pcb_redis.module

<?php

/**
 * @file
 * Module file for pcb_redis.
 */

use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Implements hook_help().
 */
function pcb_redis_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case 'help.page.pcb_redis':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('This module further enhances ability of pcb by allowing use of Redis as cache backend.') . '</p>';

      return $output;
  }
}