BTRFS resize documentation

In the Enhance documentation (https://enhance.com/docs/backup-role/resizing-btrfs-volume.html) for expanding BTRFS disk used for backups it says to use.

btrfs fs resize max /mountpoint

That however results in: btrfs: unknown token 'fs'
Using "btrfs filesystem resize max /mountpoint" works

Thanks for pointing this out. We'll update the docs.

I see the documentation to increase. Is there the ability and documentation to decrease the size of the storage?