diff --git a/modules/objdetect/doc/pics/lena-face-detection.jpg b/modules/objdetect/doc/pics/lena-face-detection.jpg
new file mode 100644
index 0000000000..d8b1e660ca
Binary files /dev/null and b/modules/objdetect/doc/pics/lena-face-detection.jpg differ
diff --git a/modules/objdetect/include/opencv2/objdetect/face.hpp b/modules/objdetect/include/opencv2/objdetect/face.hpp
index 1b3681c652..a8e98c4012 100644
--- a/modules/objdetect/include/opencv2/objdetect/face.hpp
+++ b/modules/objdetect/include/opencv2/objdetect/face.hpp
@@ -54,10 +54,20 @@ public:
 
     CV_WRAP virtual int getTopK() = 0;
 
-    /** @brief A simple interface to detect face from given image
-     *
+    /** @brief Detects faces in the input image. Following is an example output.
+
+     * ![image](pics/lena-face-detection.jpg)
+
      *  @param image an image to detect
-     *  @param faces detection results stored in a cv::Mat
+     *  @param faces detection results stored in a 2D cv::Mat of shape [num_faces, 15]
+     *  - 0-1: x, y of bbox top left corner
+     *  - 2-3: width, height of bbox
+     *  - 4-5: x, y of right eye (blue point in the example image)
+     *  - 6-7: x, y of left eye (red point in the example image)
+     *  - 8-9: x, y of nose tip (green point in the example image)
+     *  - 10-11: x, y of right corner of mouth (pink point in the example image)
+     *  - 12-13: x, y of left corner of mouth (yellow point in the example image)
+     *  - 14: face score
      */
     CV_WRAP virtual int detect(InputArray image, OutputArray faces) = 0;