diff --git a/docs/13.利用PCA来简化数据.md b/docs/13.利用PCA来简化数据.md
index 7b2f7ef3..8a89a427 100644
--- a/docs/13.利用PCA来简化数据.md
+++ b/docs/13.利用PCA来简化数据.md
@@ -201,6 +201,8 @@ def pca(dataMat, topNfeat=9999999):
     return lowDDataMat, reconMat
 ```
 
+[完整代码地址](https://github.com/apachecn/MachineLearning/blob/master/src/python/13.PCA/pca.py): <https://github.com/apachecn/MachineLearning/blob/master/src/python/13.PCA/pca.py>
+
 ### 要点补充
 
 ```