Tenn. Code Ann. § 48-20-101: Authority to amend

(a) A corporation may amend its charter at any time to add or change a provision that is required or permitted in the charter or to delete a provision not required in the charter. Whether a provision is required or permitted in the charter is determined as of the effective date of the amendment.

(b) A shareholder of the corporation does not have a vested property right resulting from any provision in the charter or bylaws, including provisions relating to management, control, capital structure, dividend entitlement, or purpose or duration of the corporation.