public function incr($key, $offset = 1)
    {
        /**
         * incr <key> <value> [noreply]\r\n
         */

        // Build packet to send ...
        $data = self::COMMAND_INCR . self::COMMAND_SEPARATOR   .
                $key                   . self::COMMAND_SEPARATOR   .
                $offset                . self::COMMAND_TERMINATOR;

        return $this->send(self::COMMAND_INCR, $data);
    }