diff --git a/modules/nonfree/doc/feature_detection.rst b/modules/nonfree/doc/feature_detection.rst index bd963fd41..5d25c1e19 100644 --- a/modules/nonfree/doc/feature_detection.rst +++ b/modules/nonfree/doc/feature_detection.rst @@ -126,3 +126,5 @@ Detects keypoints and computes SURF descriptors for them. :param params: SURF algorithm parameters in OpenCV 1.x API. The function is parallelized with the TBB library. + +If you are using the C version, make sure you call ``cv::initModule_nonfree()`` from ``nonfree/nonfree.hpp``.