When does loan forgiveness actually occur/What to do after 120 payments?

I have good news (I think) that I have finally reached 120 payments and on Fedloan.com it says "Congratulations! You have satisfied your obligation, and no additional payments are required for this loan."

When does loan forgiveness actually occur at this point? Any other pointless forms I need to fill out? Of course I can't find any information about this on the website.