protected function getMarkupComment()
    {
        $markupComment = null;

        foreach ($this->getCommentSections() as $commentSection) {
            // Identify the markup comment by the Markup: marker
            if (preg_match('/^\s*Markup:/i', $commentSection)) {
                $markupComment = $commentSection;
                break;
            }
        }

        return $markupComment;
    }