public function comment( $str, $wordwrap = 80 )
	{
		$str = trim( wordwrap( $str, $wordwrap ) );
		$str = str_replace( "\n", "\n".' * ', $str );
		$str = str_replace( "\n".' * *', "\n".' **', $str );
		return $this->add( "/**\n * ".$str."\n */" );
	}