The imposition of the requirements of this section shall be treated as a material modification in the terms of the plan described in section
1022
(a)(1) of this title, for purposes of assuring notice of such requirements under the plan; except that the summary description required to be provided under the last sentence of section
1024
(b)(1) of this title with respect to such modification shall be provided by not later than 60 days after the first day of the first plan year in which such requirements apply.