Oklahoma City Employee Retirement System might begin talks this summer about adding an alternatives allocation, said Rena Hutton, retirement system manager. The $408 million system is looking to diversify and to increase returns, Ms. Hutton said. Trustees will decide in June or July whether to go into formal discussions about the matter, she said; the type of investment and size of any new portfolio have not been determined. Asset Consulting Group will assist. The plan's current asset allocation is 60% equity and 40% fixed income.