(40 ILCS 5/16-149.3) (from Ch. 108 1/2, par. 16-149.3)
    Sec. 16-149.3. Increase in disability retirement annuity. An annuitant who retired on account of disability prior to July 22, 1947 may have the amount of his annual disability retirement annuity increased to $400 upon contributing an amount equal to the lesser of: (1) one month's current annuity, or (2) the difference between the current annual annuity and $400.
    The increase in disability retirement annuity provided under this Section shall be effective as of the first month following receipt of the required contribution from the annuitant.
(Source: P.A. 83-1440.)