void DescriptorMatcher::radiusMatch() // description unclear (Bug #2967)

ORIGINAL 2.4.5 DOCU
void DescriptorMatcher::radiusMatch()
...
maxDistance – Threshold for the distance between matched descriptors.

For each query descriptor, the methods find such training descriptors that the distance between the query descriptor and the training descriptor is equal or smaller than maxDistance. Found matches are returned in the distance increasing order.
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'distance' has 2 meanings. If you do optical flow using descriptors, your first guess is coordinate_distance, even knowing that there is a descriptor_distance related to the function.
I know 2 people also woundering about it and loosing 1 hour - same happed to me.
So I would write:
maxDistance – Threshold for the distance between matched descriptors. This does not mean the distance between coordinates which is measured in Pixels!

thanks.