Yes, this was established when the feature was introduced. Scroll back to the beginning of the thread, you will bee the answer by post 12.
Thanks tried searching the thread and must have missed it.
Since none of my credit cards have grocery stores for a bonus category this quarter, I'll buy a large Kroger gift card to use since I have ton of points and also non restaurant gift cards they sell.
Thought about buying the restaurant gift cards for Christmas for the points but am probably better off waiting since the promo gift cards restaurants give out at holiday time are worth more than the points I'd be redeeming.