View file upload/library/XenForo/Route/Prefix/Help.php

<?php

class XenForo_Route_Prefix_Help implements XenForo_Route_Interface
{
	/**
	 * Match a specific route for an already matched prefix.
	 *
	 * @see XenForo_Route_Interface::match()
	 */
	public function match($routePath, Zend_Controller_Request_Http $request, XenForo_Router $router)
	{
		$request->setParam('page_name', $routePath);

		return $router->getRouteMatch('XenForo_ControllerPublic_Help', 'index');
	}

	/**
	 * Method to build a link to the specified page/action with the provided
	 * data and params.
	 *
	 * @see XenForo_Route_BuilderInterface
	 */
	public function buildLink($originalPrefix, $outputPrefix, $action, $extension, $data, array &$extraParams)
	{
		return XenForo_Link::buildBasicLinkWithStringParam($outputPrefix, $action, $extension, $data, 'page_name');
	}
}