[phenixbb] About the phenix.mtz_as_cif

Dear developers, Could you please let me know where I can find the documentation for phenix.mtz_as_cif? For other modules, if I type (--help) I can get good instruction of how to use it (for example, phenix.elbow --help). "phenix.mtz_as_cif --help" does not give useful information. I am using the latest public version. Regards, Huanwang