I forgot to add a sport to my UC App should I email a correction

I only listed 4 activities in my UC app so theres still space for one when I submitted. I only took cross xc/track for 9th and 10th grade so it really isn’t that notable, but I’m wondering if I should email the colleges to add it. Does not mentioning any athletics look really bad and if it was a school sport do they look at my transcript anyways for admissions? Would I also mention any unofficial running outside of school, probably not right?

I do not believe this would have a significant impact on your chances