diff --git a/无进位乘法和GHASH.md b/无进位乘法和GHASH.md
index b870fa3..79299fd 100644
--- a/无进位乘法和GHASH.md
+++ b/无进位乘法和GHASH.md
@@ -1,6 +1,10 @@
 # 参考
 * [Cryptographic Hardware and Software and useful architectures](https://www.esat.kuleuven.be/cosic/events/ecrypt-net-school-2018/wp-content/uploads/sites/23/2018/10/kos-school-gueron-2.pdf)
 * The Galois/Counter Mode of Operation (GCM)
+* Recommendation for Block 
+Cipher Modes of Operation: 
+Galois/Counter Mode (GCM) 
+and GMAC
 * Optimized Galois-Counter Mode implementation on Intel®
 Architecture 
 Processors
@@ -10,3 +14,4 @@ Architecture
 Processors
 
 
+