I received this notice when I checked the Where’s my refund irs.gov website.?

Alrisha Asked: I received this notice when I checked the Where’s my refund irs.gov website.?

Irs.gov : We have received your tax return and it is being reviewed. You will receive a notice from us requesting additional information from you. When you receive the notice, please provide the requested information within 30 days. You may not receive all or a part of your refund until we receive and review the information we requested from you. If you need more information after you receive our notice, call the number on the notice.

I am pretty sure it has something to do with the EIC I claimed my niece and nephew this year when I filed my taxes January 17,2012 through H&R block. I am 21 years old and was employed January through July of 2011. I received 9 unemployment insurance checks then I was cancelled. I cared for my niece and nephew due to there mom only receiving welfare.I just would like to know what documents you all think that they will need from me. Thank you