LSAT addendum?

I took the lsat about 5 years ago and got a 151. I backed away from the law school stuff till this admissions cycle. and just got a 161. 5 years ago I half ass studied for about a month and took it more or less cold. This past time I studied with 7sage for about 9 months. Given the 10 point disparity, is it worth submitting an addendum to my applications explaining the difference?