Augusta, Georgia (CNN) -- Tiger Woods was penalized two strokes Saturday after a rules committee deemed he violated one of golf's ball-drop rules during Friday's play, an official with the Masters Tournament said. "I didn't know I had taken an incorrect drop prior to signing my scorecard," Woods said in a four-part tweet on Saturday. "I understand and accept the penalty and respect the Committees' decision." On Friday, Woods, a four-time tournament champion, hit a shot on the 15th hole that ricocheted off the flagstick and bounced into a pond. Woods took a drop then bogeyed the hole. "After being prompted by a television viewer, the Rules Committee reviewed a video of the shot (after the drop) while he was playing the 18th hole," Fred Ridley, the Augusta National Golf Club's competition committee chairman, said in a written statement.
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NEW: Woods says the punishment was fair, adding, "I made a mistake"
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Woods says he didn't mean to break any rules
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Official says Woods was "forthright' during meeting Saturday meeting
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The trouble started when his shot hit the flag stick and bounced into the water
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At that time the committee determined Woods hadn't broken any rules, but later met with @placeholder after he described on television where he stood to drop the ball.