Forgot to send requested document

[mudnaved]

CIC Buffalo returned my application packet stating that i need to submit my Residence history and copy of I-20. I resubmitted my application with all paperwork but i forgot to submit a copy of Present I-20 which Buffalo consulate requested. Can I send my I20 Copy separately to them or should i wait for their reply? Whom should i contact in Consulate regarding it?

[explorer101]

Although the requirement is to send all the documents in one go, still send the remaining documents with a forwarding letter explaining inadvent mistake