Buzz me when your done.?

Question

? is that proper way or should I be using the term?

Buzz me when you are done.

English experts out there let me know if there is rule I am missing. Which is the proper form to be writting with? Thank You

Answer 1

Buzz me when you're done

You're = you are

your = something YOU own (like your toy, your car, your arm, your mind, etc)