diff --git a/Falcon.SugarApi/Encryption/IEncryption.cs b/Falcon.SugarApi/Encryption/IEncryption.cs
index ab8ad21..23fdb1f 100644
--- a/Falcon.SugarApi/Encryption/IEncryption.cs
+++ b/Falcon.SugarApi/Encryption/IEncryption.cs
@@ -1,4 +1,6 @@
-namespace Falcon.SugarApi.Encryption
+using System;
+
+namespace Falcon.SugarApi.Encryption
 {
     /// <summary>
     /// 基础加密解密接口
@@ -11,14 +13,15 @@
         /// <param name="key">key</param>
         /// <param name="str">密文</param>
         /// <returns>明文</returns>
-        string Decrypt(string key, string str);
+        /// <exception cref="FormatException">提供的字符串格式错误</exception>
+        string Decrypt(string key,string str);
         /// <summary>
         /// 通过key加密字符串
         /// </summary>
         /// <param name="key">key</param>
         /// <param name="str">明文</param>
         /// <returns>密文</returns>
-        string Encrypt(string key, string str);
+        string Encrypt(string key,string str);
         /// <summary>
         /// 生成加密key
         /// </summary>