async def mark_broken(self, *, comment: str = None):
        """Mark broken.

        :param comment: Reason machine is broken.
        :type comment: `str`
        """
        params = {
            "system_id": self.system_id
        }
        if comment:
            params["comment"] = comment
        self._data = await self._handler.mark_broken(**params)
        return self