Additional provisions not affecting negotiability.
Section 5
SEC. 5. Additional provisions not affecting negotiability.—An instrument which contains an order or promise to do any act in f addition to the payment of money is not negotiable. But the negotiable character of an instrument otherwise negotiable is not affected by a provision which— (a) Authorizes the sale of collateral securities in case the instrument be not paid at maturity; or (b) Authorizes a confession of judgment if the instrument be not paid at maturity; or (c) Waives the benefit of any law intended for the advantage or protection of the obligor; or (d) Gives the holder an election to require something to be done in lieu of payment of money. But nothing in this section shall validate any provision or stipulation otherwise illegal.