There was a firecracker lit off in our basement of the house we are having built.?

There was a firecracker lit off in our basement of the house we are having built. Luckily it didn't burn down. But the had to replace the pit in the basement and the whole house smells like smoke (no drywall up yet, only wood). So they want us to sign a disclosure about the incident. I am concerned about resale and how if we sign this it will affect us. Will we have to disclose this to future buyers. What if the smell doens't go away!