The holders of bonds issued under this Act possess a lien on the income and revenues derived by an authority from the industrial projects for which the bonds are issued. The governing body of the authority may provide, in the resolution or resolutions authorizing the bonds, for issuance of additional bonds to be equally and ratably secured by a lien on such income and revenues, or they may provide that the lien on such income and revenues for future bonds are subordinate.
50 ILCS 445/8