First of all, it's not fraud. For fraud, you would have had to
intentionally withhold/alter information. In the very worst case they would not accept your application and you have to reapply. But you do NOT face any charges for it, no worries.
Secondly, it definitely can't hurt that once you received AOR you submit that additional info. Simply write it down and mention that you misread the instructions.
Here is the information on how to do that:
http://www.cic.gc.ca/english/contacts/web-form.asp
Please note that you have to wait for AOR (usually 4-6 weeks) before you can submit anything.