How to change controlfile autobackup format in rman?

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How to change controlfile autobackup format in rman?
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[oracle@wasiq prod]$ rman

Recovery Manager: Release 11.2.0.1.0 - Production on Fri Dec 27 22:07:16 2013

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RMAN> connect target /;

connected to target database: PROD (DBID=246965557)

RMAN> configure controlfile autobackup format for device type disk to '/backup/rman/prod/%F';

using target database control file instead of recovery catalog
new RMAN configuration parameters:
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/backup/rman/prod/%F';
new RMAN configuration parameters are successfully stored

RMAN> show controlfile autobackup format;

RMAN configuration parameters for database with db_unique_name PROD are:
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/backup/rman/prod/%F';

RMAN>