Updating Colleges About Activities

I finished turning in applications about two months ago, but a significant development has occurred in one of my activities that I think would reflect favorably on me and my applications, and I have been advised to notify my schools about this development. So, I’m curious if it’s frowned upon by colleges to send in updates about activities, and if not, what is the best way to let them know? Any feedback would be appreciated!

You can use your portal or email the regional rep. If it’s actually noteworthy, do so. You don’t need a special form.