Mistake on UC App

So just today I hopped on my UC app again to get some information for other colleges apps and I realized a mistake I made in volunteer and community service category, for one service work that I did I put 11 grade when I did it in 9 grade only. I was wondering if this is a big enough mistake that I should notify the admissions office or is it ok to let this one slide?

Not worth emailing admissions.