diff --git a/SM4性能优化.md b/SM4性能优化.md
index 47bd8f4..0794d3a 100644
--- a/SM4性能优化.md
+++ b/SM4性能优化.md
@@ -1,4 +1,5 @@
 先学习一下：
 
 参考资料：
-* [SM4的快速软件实现技术](https://m.doc88.com/p-1823908753601.html)
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+* [SM4的快速软件实现技术](https://m.doc88.com/p-1823908753601.html)
+* [SM4的快速软件实现技术](http://html.rhhz.net/ZGKXYDXXB/20180205.htm)
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