Stocks added modest gains on Tuesday after the Federal Reserve held benchmark rates near zero and repeated its promise to keep them exceptionally low for an extended period, as expected.

* The Dow Jones industrial average <.DJI> added 17.23 points, or 0.16 percent, to 10,659.38. The Standard & Poor's 500 Index <.SPX> rose 5.33 points, or 0.46 percent, to 1,155.84. The Nasdaq Composite Index <.IXIC> was up 9.44 points, or 0.40 percent, at 2,371.65.

(Reporting by Leah Schnurr; Editing by Jan Paschal)