40 ILCS 5/5-206: Gift reserve.

Amounts received by the board for any purpose under any other law or as gifts, grants, or bequests, or in any manner other than as provided in this Article, shall be credited to this reserve and the same shall be used for such purposes of the fund as the board may decide. The balance in this reserve shall be annually improved by interest at the rate realized by the Board on its investments in the previous year.