For December, you can get an extra 5% cash back on groceries purchases in addition to restaurants and movies. The maximum is only up to $200 on groceries purchases which is $10 cash bonus. This only work on Discover cards that do not have 5% permanent cash back such as the Discover More or Discover Motiva Card.

In order to get the 5% cash back on groceries, you must login into your Discover account. Then click here to go directly for the sign up page.

Here’s a screenshot of the promo.