San Mateo County Employees' Retirement Association, Redwood City, Calif., committed $20 million to KSL Capital Partners VI.
The $5.5 billion pension fund's board approved the commitment to the buyout fund at its meeting on Tuesday, a news update on its website said.
It is the pension fund's first known commitment to a fund managed by KSL Capital Partners.
As of Sept. 30, the pension fund's actual allocation to private equity was 6.6%; the target is 7%.
Michael Coultrip, chief investment officer, could not be immediately reached for further information.