3G Subject to Revenue Approval the Designated Employer and the Trustee may enter into a supplemental agreement altering any of the options contained in the Deed of Establishment and Participation. This supplemental agreement shall include a statement of how benefits shall be calculated in respect of Members' Service and contributions before the date of alteration. The Trustee shall notify the Participating Employers and Pensions Committee for the relevant Section of the terms of any supplemental agreement entered into under this Clause 3G.