How to append a storage space to an existing ZFS partition?

Hi
I used the following command to increase space of an existing pool:

sudo zpool add tank /dev/sdc

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But it didn't dynamically increase the volume of the storage. In another words, the available space of zpool increased, but didn't affect on the space of the zfs partition. I'm NOT looking for mirroring (redundancy). I'm just going to expand the partition size. Indeed I've data on the zfs partition. At first I used:

sudo zpool create tank /dev/sdb
sudo zfs create -o...

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