From c52d620817ff766fec9d9bda55b6b29d334df285 Mon Sep 17 00:00:00 2001
From: Vincent Rabaud <no@email>
Date: Tue, 10 Jul 2012 19:09:00 +0000
Subject: [PATCH] update the docs for cvExtractSURF and initModule_nonfree()

---
 modules/nonfree/doc/feature_detection.rst | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/modules/nonfree/doc/feature_detection.rst b/modules/nonfree/doc/feature_detection.rst
index bd963fd41d..5d25c1e19b 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``.