diff --git a/idl/us-en/StringDecoder.idl b/idl/us-en/StringDecoder.idl
index b4d6b224c1..4f447d9f44 100644
--- a/idl/us-en/StringDecoder.idl
+++ b/idl/us-en/StringDecoder.idl
@@ -1,3 +1,6 @@
+
+/*! @brief Stream decode Object
+ */
 interface StringDecoder : object
 {
   /*! @brief decoder object constructor
diff --git a/idl/zh-cn/StringDecoder.idl b/idl/zh-cn/StringDecoder.idl
index dff30f13cd..86cd03983b 100644
--- a/idl/zh-cn/StringDecoder.idl
+++ b/idl/zh-cn/StringDecoder.idl
@@ -1,3 +1,6 @@
+
+/*! @brief 流解码对象
+ */
 interface StringDecoder : object
 {
   /*! @brief 解码器构造函数