diff --git a/Algorithm/AI/Deep_Learning_Haar_Cascade_Explained.md b/Algorithm/AI/Deep_Learning_Haar_Cascade_Explained.md
index fb34c4a..a066977 100755
--- a/Algorithm/AI/Deep_Learning_Haar_Cascade_Explained.md
+++ b/Algorithm/AI/Deep_Learning_Haar_Cascade_Explained.md
@@ -127,3 +127,4 @@ Haar 级联分类器最著名的应用是检测图像中的人脸或身体，但
 [Deep Learning Haar Cascade Explained](http://www.willberger.org/cascade-haar-explained/)  
 [浅析人脸检测之Haar分类器方法：Haar特征、积分图、AdaBoost、级联](https://blog.csdn.net/zouxy09/article/details/7922923)  
 [AdaBoost & AdaRank](https://my.oschina.net/supersonic/blog/379438)  
+[Cascade Classifier Training](https://docs.opencv.org/2.4/doc/user_guide/ug_traincascade.html)