Finding fundamental matrix using RANSAC and 15 points

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I want to find fundamental matrix using RANSAC having 10 points and find a bug(?) or discrepancy between documentation and source code. https://github.com/Itseez/opencv/blob/master/modules/calib3d/src/fundam.cpp#L710 this code says that I must have 15 points to use RANSAC (otherwise it use LMEDS even if I chose RANSAC), but http://docs.opencv.org/modules/calib3d/doc/camera_calibration_and_3d_reconstruction.html#Mat%20findFundamentalMat%28InputArray%20points1,%20InputArray%20points2,%20int%20method,%20double%20param1,%20double%20param2,%20OutputArray%20mask%29 says that RANSAC work with >= 8 points (seems obvious to me). Can someone explain to me "why 15"? I spent a lot of time to finding a mistake in my program.