EAD needs additional infomation, NSC

Filed 140/485 on Sep, 140 approved on Oct 18.

I got email from NSC yesterday about EAD application. It said:

On November 18, 2005, we mailed a notice requesting additional evidence
or information in this case. The notice explains in detail what
additional material is needed. ...

Anyboy knows what kind of infomation they need?

Thanks!