Question about Revel Escalade

Attempting my third rebuild/paint of this one and have noticed there is a notch in the A pillar on the drivers side, its not something I have done and I havn't noticed it before, any ideas? is it for some part in a diferent version or is there something that isn't shown on the insructions?

Hmmm, i'll take a look at mine tonight and get back to you.