diff --git a/SM3中的FF2和GG2函数.md b/SM3中的FF2和GG2函数.md
index 3312ef7..baeff54 100644
--- a/SM3中的FF2和GG2函数.md
+++ b/SM3中的FF2和GG2函数.md
@@ -72,3 +72,6 @@ $(X \land Y \land \lnot Z) \lor (X \land Z \land \lnot Y) \lor (Y \land Z)$
 = $(X \land Y \land \lnot Z) \lor (X \land Y \land Z) \lor (X \land Z \land \lnot Y) \lor (X \land Y \land Z) \lor (Y \land Z)$  
 = $(X \land Y) \lor (X \land Z) \lor (Y \land Z)$  
 
+相关知识：
+* $A \bigoplus B = (\lnot A \land B) \lor (A \land \lnot B) $
+* [布尔代数运算律](https://baike.baidu.com/item/%E5%B8%83%E5%B0%94%E4%BB%A3%E6%95%B0%E8%BF%90%E7%AE%97%E5%BE%8B/22804079)
\ No newline at end of file