diff --git a/hutool-crypto/src/main/java/cn/hutool/crypto/symmetric/SM4.java b/hutool-crypto/src/main/java/cn/hutool/crypto/symmetric/SM4.java
index 2f592dcf6..72dd9b9cd 100644
--- a/hutool-crypto/src/main/java/cn/hutool/crypto/symmetric/SM4.java
+++ b/hutool-crypto/src/main/java/cn/hutool/crypto/symmetric/SM4.java
@@ -12,6 +12,11 @@ import javax.crypto.spec.IvParameterSpec;
 /**
  * SM4实现
  *
+ * 国密算法
+ * 1、非对称加密和签名：SM2
+ * 2、摘要签名算法：SM3
+ * 3、对称加密：SM4
+ *
  * @author Looly
  * @since 4.6.8
  */