Promotional Code for free Gift

Greetings…

We are trying to setup a coupon for First time order with our store. If the customers enters the code
we will include a complimentary gift in with their order.

My questions is this…When I placed an order and entered the code, it was Not displayed anywhere in the /
order confirmation. So, how would I know if the customer entered the code to receive the complimentary gift?

Any help would be greatly appreciated,

David
The TreeHouse