When I did the I-539 e-filing last night for my parents, I forgot to answer the part 4 (Additional Information): (if you answered "No" to Question 3g, fully describe how you are supporting yourself, include the sources, amount and basis for any income). I just simply left it blank when I did the e-filing.
I called the helpline and my case was not available yet. How could I makeup for such a stupid mistake?
Thanks very much and happy holiday!