expand software Raid 5 on windows 2012 R2

Hi,  We have 3 x 1TB Disks configured using windows 2012 storage pools.

Created a storage pool with the 3 disks and have about 2.7TB of space.
Then----I added 1 more TB Drive, added it as a physical disk, but when I go to the virtual disks section and try to extend---I am not able to extend it.    (somewhere I read that it may have to do with Columns where I would need a total of 3 additional disks and then I can extend).  However, I do not have or want to add 3 new drives just to extend this existing storage pool by 1 extra TB.   Anyone know the proper procedures to do this?
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Cliff GaliherCommented:
Storage spaces doesn't rebalance data so you do have to add disks in sets. The number in a set is determined by the initial configuration, which in your case was three.

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Windows Server 2012

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