public function addEndnote($noteText, PHPRtfLite_Font $font = null, PHPRtfLite_ParFormat $parFormat = null)
    {
        $endnote = new PHPRtfLite_Endnote($this->_rtf, $noteText, $font, $parFormat);
        $this->_elements[] = $endnote;
        return $endnote;
    }