Looking at the file names under [2], it looks like that might be true for the neutron client as well.

[1] https://github.com/openstack/python-openstackclient/blob/master/openstackclient/network/v2/network_qos_rule.py#L25-L28

[2] https://github.com/openstack/python-neutronclient/tree/master/neutronclient/neutron/v2_0/qos

Best wishes - Nell