Do I have to disclose all my property in a prenup?

I want a simple prenup before I get married that says I keep whatever is in my name if the marriage breaks up and she keeps whatever is in her name. If we buy something jointly, we split it equally. I don’t want to go into detail in the prenup because I have a lot of assets she doesn’t know about. I’m concerned that if she finds out, she’ll never sign a prenup. If she does sign a simple prenup under these terms and finds out later about the other properties I have, will the prenup still be valid?