I accidentally wrote Sept 2007-Dec 2007 instead of Sept 2006-Dec2006 for my quarter that I spent abroad. It was the 2006-2007 school year, so it felt like "2007" Anyway, I doubt schools will even really notice. On my coursework section the classes I took while abroad are listed under Fall 2006. However, this obviously doesn't match with my "15 activities" section where I listed it as 2007. Is it worth it to send an addendum to each school when I send in the secondary application explaining that I put the wrong year on the AMCAS for this one activity? I list a bunch of other on-campus activities that happen during fall 2007, so I obviously couldn't be abroad at the same time. It wouldn't be too much trouble on my part to mail in an addendum, and I'd rather explain it than have them be confused about why the dates don't match. But, is it just a waste of effort if they don't really notice that kind of thing anyway?