public function checkRule(TypoScriptFrontendController $frontendController, string $uri, array &$explanation, bool &$skipProcessing)
    {
        if (!$frontendController->isStaticCacheble()) {
            $explanation[__CLASS__] = 'The page is not static cacheable via TypoScriptFrontend. Check the first Question on: https://github.com/lochmueller/staticfilecache/blob/master/Documentation/Faq/Index.rst';
        }
    }