If a State's or interstate instrumentality's Section 218 Agreement does not include
            coverage of retirement system positions in the definition of a “coverage group,” a
            Modification to the Agreement is necessary before coverage can be extended to positions
            covered under a retirement system. The Modification should state:
         
         
            Paragraph (4) of Part A of said Agreement (Definitions) is amended to read:
            
         
         
            The term “coverage group” means a coverage group as defined in Section 218(b)(5) of
               the Social Security Act, and for the purpose of Section 218(c) of the Social Security
               Act only, the term “coverage group” shall also mean a coverage group as defined in
               Section 218(d)(4) of the Social Security Act.