Sending extra information after the Common App?

I applied to be in my school’s National Honor Society and the results will be coming out in a week or two. If I already sent in my Common App to my EA college, will I be able to edit the common app and add in “National Honor Society” in the Honors section and send it again? If not, how do I inform that college that I was accepted into NHS? (If I did get accepted).

Do colleges want to hear about new achievements after the common app is sent?

Yes. For major updates, you can email them and by major, I mean a key regional or national award. For NHS, I would not bother with an update.

You can’t edit the Common App after submission to a particular college. You could edit the Common App and then submit it to other colleges, but you can’t edit ones you’ve sent already. Submitting the Common App is like putting your application in an envelope and mailing it. You can add info by emailing or writing a letter to the college.