To amend section 8339(p) of title 5, United States Code, to clarify the method for computing certain annuities under the Civil Service Retirement System which are based on part-time service, and for other purposes.

Applies provisions governing the computation of an annuity under the Civil Service Retirement System (CSRS) for a Federal employee whose service includes service that was performed on a part-time basis to: (1) service performed before April 7, 1986, with respect to basing average pay on the basic pay for full-time service; and (2) service performed after such date with respect to calculating the benefit by prorating total service to reflect part-time service. Provides for the recomputation of an annuity for any individual who performed any service creditable under CSRS (or under the Federal Employees Retirement System, to the extent of any portion of such annuity which is computed under CSRS) before such date and who was separated from the service on or after such date and before the enactment of this Act. Directs the Office of Personnel Management to inform individuals entitled to have an annuity recomputed under this Act.