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

only file:  common_interfaces_of_descriptor_matchers.rst

modules/features2d/doc/common_interfaces_of_descriptor_matchers.rst

@@ -217,7 +217,7 @@ For each query descriptor, finds the training descriptors not farther than the s
 
     :param compactResult: Parameter used when the mask (or masks) is not empty. If  ``compactResult``  is false, the  ``matches``  vector has the same size as  ``queryDescriptors``  rows. If  ``compactResult``  is true, the  ``matches``  vector does not contain matches for fully masked-out query descriptors.
 
-    :param maxDistance: Threshold for the distance between matched descriptors.
+    :param maxDistance: Threshold for the distance between matched descriptors. Distance means here metric distance (e.g. Hamming distance), not the distance between coordinates (which is measured in Pixels)!
 
 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.