Richard Drew, Associated Press
Federal Reserve Chair Janet Yellen's Washington, D.C. news conference is on a television screen behind specialist Gernaro Saporito as he works at his post on the floor of the New York Stock Exchange, Wednesday, March 19, 2014. S

WASHINGTON — A Federal Reserve official who dissented from this week's policy decision says the Fed should have outlined a plan to keep a key interest rate at a record low until unemployment falls below 5.5 percent.

The Fed's policy statement no longer cites a specific unemployment rate that might lead it eventually to raise short-term rates. The Fed instead says it will monitor a range of information before approving any rate increase.

Narayana Kocherlakota, president of the Fed's Minneapolis bank, says this shift, approved 8-1, will foster uncertainty.

In a statement Friday, Kocherlakota says lowering the threshold for considering a rate hike from 6.5 percent unemployment to 5.5 percent would have enhanced the Fed's commitment to low rates until inflation nears its 2 percent target. The unemployment rate is 6.7 percent.