The wsrep_provider options are missing from the mariadb --help commandline list

$ ./bin/mariadbd --help --verbose

[..]

  --wsrep-provider=name 

                      Path to replication provider library

  --wsrep-provider-options=name 

                      Semicolon (;) separated list of wsrep options (see

                      wsrep_provider_options documentation).

  --wsrep-recover     Recover database state after crash and exit

[..]

$