diff --git a/README.md b/README.md
index e483959..932ca3e 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,10 @@
 # SMO
 Sequential minimal optimization algorithm for SVM
 
-See the link below for a detailed program documentation and the derivation of the algorithm(in Chinese):
+See the link below for a detailed program documentation(in Chinese): 
 
 https://zhuanlan.zhihu.com/p/36169167
+
+See the link below for a detailed progra documentation(in English):
+
+https://github.com/PrimerLi/smo-scala/blob/master/smo.pdf