resync catalog, error in doc 10g

doc

RMAN> resync catalog;

new incarnation of database registered in recovery catalog
starting full resync of recovery catalog
full resync complete

RMAN> resync catalog;

starting full resync of recovery catalog
full resync complete

-- And that form does not work (but would be really useful)
RMAN> RESYNC CONTROLFILE FROM CONTROLFILECOPY '/tmp/cfile.dbf';

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00558: error encountered while parsing input commands
RMAN-01009: syntax error: found "controlfile": expecting one of: "catalog"
RMAN-01007: at line 1 column 8 file: standard input