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No addendum is needed. I had a similar situation from high school that had a bigger impact on my LSAC GPA and my cycle played out the way that my numbers would have indicated.

Blahh_Blahh wrote: My undergrad GPA now is 3.85 including that one class but jumps to 3.95 once it has been standardized by LSAC (yes, my college gives out A+'s).

Your GPA is excellent. I would not write an addendum drawing attention to the weakest part of your transcript, especially if it occurred even before you graduated from high school.