The authority may provide for a procedure by which certain specified terms and conditions of any resolution, contract, or agreement may be subsequently amended or modified, or any provision thereof waived, with the consent of the authority and the vote or written assent of the holders of a specified principal amount of the bonds issued and outstanding. Such provision may authorize meetings of bondholders and specify the manner in which the consent of the bondholders may be given. Such provision shall specifically state the effect of such amendment, modification, or waiver upon the rights of the holders of all of the bonds and interest coupons appertaining to the bonds, whether attached to or detached from the bonds.