A summary plan description of any employee benefit plan shall be furnished to participants and beneficiaries as provided in
section 1024(b) of this title. The summary plan description shall include the information described in subsection (b), shall be written in a manner calculated to be understood by the average plan participant, and shall be sufficiently accurate and comprehensive to reasonably apprise such participants and beneficiaries of their rights and obligations under the plan. A summary of any material modification in the terms of the plan and any change in the information required under subsection (b) shall be written in a manner calculated to be understood by the average plan participant and shall be furnished in accordance with
section 1024(b)(1) of this title.