That is the same thing mine said. I got a packet & I had to send in proof for everything, that my children lived with me (documentation from school/doctor) and that they were related to me (birth certificates) and to prove head of household I had to send it all sorts of information from my landlord and utility companies. It's called a correspondence audit, I guess yours could always be different but from everything I've read online you'll probably get the same thing. I had to have all that in within 30 days and once I sent it in I have not heard anything. Who knows when I will get my refund:(
