I'll also go through this document.
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You don't need to issue a BACKUP CONTROLFILE command
you need to track the controlfile autobackups that are created.
If you are copying your database and archivelog backups to Tape or a VTL, you must also include the controlfile autobackups into such Tape / VTL backups.
I've come across a few cases where DBAs forget to backup the controlfile autobackups to tape.
Hemant K Chitale
Thank you - I have configured "configure controlfile autobackup on" for all databases being backed up using RMAN. All backups are going to DISK.