Yes--don't sign it. You say you have "no alternative," but unless he is holding a gun to your head (or the equivalent) as he puts a pen in your hand and forces you to sign, you *do* have an alternative: you can legally refuse to sign if you don't trust it. If you do sign, you will be liable for whatever is in it: it is NOT a defense to say that you don't know if it is true or complete, since the law does not accept ignorance of what you choose to sign as a defense. You are legally presumed to understand and agree to what you sign.