Editing Application After Submitting

Hey all. I was wondering if anyone had any experiences regarding editing their application after it was submitted. I sent my R2 Wharton application in a few days ago, but I just noticed that I had left out some info. I had misread the prompt on the "Activities/Extracurricular" section and had thought they were only asking about post college activities, which lead me to leave out some pretty significant college extracurriculars. They're listed on my resume and I talk about one of them in some detail in my essays, so it's not like they're entirely left out of the application, but I'd hate to have it look like I was remiss in filling out the app and get dinged as a result. I'd really like to go back in and fix this - it would literally take less than a minute - but the application's already submitted so there's nothing I can do short of contacting the admissions committee. Does anyone know if the admissions committee would look unfavorably upon someone who did this? Am I making a mountain out of a molehill?