Hi there I am going through immigration with my wife who is an American citizen while I am a Canadian citizen. We have sent in our application however we did not have the results of the FBI background check yet so I attached a letter to the immigration package stating that I will send it as soon as I receive it. THe question is how would I go about doing that, I have the UCI I am just wondering if I need to write out a letter saying that it is to complete the immigration package with UCI #******** or is there a form I complete for sending additional information. Any help on this matter would be greatly appreciated!