You have taken your first RMD for 2016 , the year you turned 70 1/2 as required.
You're OK since you get a grace period for the first RMD (Apr 1, 2017).
You will also have to take your RMD for 2017 (age 71 1/2) before the deadline which is 12/31/2017.
Since you're using the grace period you have to take two RMDs for 70 1/2 and 71 1/2 in the same year.
To answer your question, it all goes on your 2017 tax return.
