The important thing is to make the school want you. If you refer to them make it brief. I whole heartedly believe in addressing the school's strengths in the personal statement. It shows that you have researched their school, and you want to attend that school. Your not just throwing your application everywhere. I don't think it should be addressed in the addendum. If your saying "why" you want to go to school in your PS, you should include "why" this school in particular will help you achieve those goals. i.e. great instructors, atmosphere, library, etc... Make sure that's really a strength of theirs. You can easily find these things out by going onto their website or from information they send to you.
One or two sentences at the end should suffice.