This Agreement may be amended from time to time by the Board to reflect the Transfer of Units or other interests in the LLC effectuated pursuant to the terms of Article X or to reflect the admission of Unitholders effectuated pursuant to the terms of Article XI . Any provisions of this Agreement may be amended, modified, supplemented or waived with the written approval of the LLC and the Principal Investors; provided , that no amendment or modification pursuant to this Section 15.3 that would by its terms adversely affect any holders of Units in a manner materially disproportionate to the other holders of Units, in their capacities as such, shall be effective against such holders without the written consent of holders of at least a majority in interest (with respect to the applicable Units) of such disproportionately materially adversely affected holders.