diff --git a/Efficient-Software-Implementations-of-ZUC.md b/Efficient-Software-Implementations-of-ZUC.md
index 107886a..ab67f83 100644
--- a/Efficient-Software-Implementations-of-ZUC.md
+++ b/Efficient-Software-Implementations-of-ZUC.md
@@ -13,3 +13,4 @@
 1. [Faster 128-EEA3 and 128-EIA3 Software](https://eprint.iacr.org/2013/428.pdf), Delayed modular reduction & Carryless multiplication
 1. [Efficient Software Implementations of ZUC-256](http://www.jcr.cacrnet.org.cn/CN/abstract/abstract479.shtml), 这篇文章有ZUC S0 和 S1 的较详细介绍。
 1. [Intel(R) Multi-Buffer Crypto for IPsec Library](https://github.com/intel/intel-ipsec-mb/)，在Intel CPU架构实现所有优化。
+1. [Intel Carry-Less Multiplication Instruction and its Usage for Computing the GCM Mode](https://www.intel.com/content/dam/develop/external/us/en/documents/clmul-wp-rev-2-02-2014-04-20.pdf)