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185673e9 · Vincent Rabaud · a9718cc7 · 185673e9
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modules/nonfree/doc/feature_detection.rst modules/nonfree/doc/feature_detection.rst +2 -0

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--- 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``.