diff --git a/crypto/master_kms_cipher.go b/crypto/master_kms_cipher.go
index 2a49335..011458e 100644
--- a/crypto/master_kms_cipher.go
+++ b/crypto/master_kms_cipher.go
@@ -64,7 +64,6 @@ func (kc *MasterKMSCipher) Encrypt(plaintext []byte) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
-	// https://cloud.tencent.com/document/product/573/34420 文档有误，返回的结果并没有base64编码
 	return []byte(*resp.Response.CiphertextBlob), nil
 }