diff --git a/doc/tutorials/features2d/feature_detection/feature_detection.rst b/doc/tutorials/features2d/feature_detection/feature_detection.rst
index 26798f8f6..1051fe5de 100644
--- a/doc/tutorials/features2d/feature_detection/feature_detection.rst
+++ b/doc/tutorials/features2d/feature_detection/feature_detection.rst
@@ -31,6 +31,7 @@ This tutorial code's is shown lines below. You can also download it from `here <
    #include "opencv2/core/core.hpp"
    #include "opencv2/features2d/features2d.hpp"
    #include "opencv2/highgui/highgui.hpp"
+   #include "opencv2/nonfree/nonfree.hpp"
 
    using namespace cv;
 
diff --git a/doc/tutorials/features2d/feature_flann_matcher/feature_flann_matcher.rst b/doc/tutorials/features2d/feature_flann_matcher/feature_flann_matcher.rst
index 54d28890a..3bf757fc0 100644
--- a/doc/tutorials/features2d/feature_flann_matcher/feature_flann_matcher.rst
+++ b/doc/tutorials/features2d/feature_flann_matcher/feature_flann_matcher.rst
@@ -28,6 +28,7 @@ This tutorial code's is shown lines below. You can also download it from `here <
    #include "opencv2/core/core.hpp"
    #include "opencv2/features2d/features2d.hpp"
    #include "opencv2/highgui/highgui.hpp"
+   #include "opencv2/nonfree/nonfree.hpp"
 
    using namespace cv;
 
diff --git a/doc/tutorials/features2d/feature_homography/feature_homography.rst b/doc/tutorials/features2d/feature_homography/feature_homography.rst
index ad764ce9b..eb06083b0 100644
--- a/doc/tutorials/features2d/feature_homography/feature_homography.rst
+++ b/doc/tutorials/features2d/feature_homography/feature_homography.rst
@@ -30,6 +30,7 @@ This tutorial code's is shown lines below. You can also download it from `here <
    #include "opencv2/features2d/features2d.hpp"
    #include "opencv2/highgui/highgui.hpp"
    #include "opencv2/calib3d/calib3d.hpp"
+   #include "opencv2/nonfree/nonfree.hpp"
 
    using namespace cv;