ck-list-sessions --format option missing but in manpage #73

The ck-list-sessions man page has:
-f, --format=format Display information using the specified format. The format value is a list of properties to display separated by commas.

when trying the example from the manpage:
$ ck-list-sessions --format="session-id,unix-user,display-type"
** (ck-list-sessions:21920): WARNING **: Unknown option --format=session-id,unix-user,display-type

--format is missing from ck-list-sessions --help also. It looks like the option just doesnt exist?