Section 40 ILCS 5/16-149.4 - Supplementary disability retirement annuity(a) An annuitant receiving a disability retirement annuity on June 30, 1961 of less than $50 for each year of creditable service forming the basis of the disability retirement annuity shall have his or her disability retirement annuity increased to $50 per year for each year of such creditable service, with a minimum annuity of $1,000 per year.(b) In order to be entitled to the increase in disability retirement annuity provided under this Section, an annuitant is required to make an additional contribution of $5 for each year of creditable service, together with interest at the rate of 3% per annum from August 25, 1961.(c) The supplementary retirement annuity provided under this Section shall begin to accrue on the first of the month following receipt of the required contributions from the annuitant.P.A. 83-1440; 91-887, eff. 7/6/2000.