文件上传body增加一个单位描述
diff --git a/java-chassis-reference/en_US/general-development/file-upload.md b/java-chassis-reference/en_US/general-development/file-upload.md
index 861af03..e4e0930 100644
--- a/java-chassis-reference/en_US/general-development/file-upload.md
+++ b/java-chassis-reference/en_US/general-development/file-upload.md
@@ -44,7 +44,7 @@
| Configuration Item | Default Value | Range of Value |
| :--- | :--- | :--- | :--- |
| servicecomb.uploads.directory | null | | In which directory the uploaded temporary file is saved, **default value null means file upload is not supported** |
-| servicecomb.uploads.maxSize | -1 | | The maximum allowable size of http body, the default value of -1 means unlimited |
+| servicecomb.uploads.maxSize | -1 | | The maximum allowable size of http body in bytes. the default value of -1 means unlimited |
## Consumer:
diff --git a/java-chassis-reference/zh_CN/general-development/file-upload.md b/java-chassis-reference/zh_CN/general-development/file-upload.md
index 0f99b7b..8a83cf9 100644
--- a/java-chassis-reference/zh_CN/general-development/file-upload.md
+++ b/java-chassis-reference/zh_CN/general-development/file-upload.md
@@ -44,7 +44,7 @@
| 配置项 | 默认值 | 取值范围 | 含义 |
| :--- | :--- | :--- | :--- |
| servicecomb.uploads.directory | null | | 上传的临时文件保存在哪个目录，**默认值null表示不支持文件上传** |
-| servicecomb.uploads.maxSize | -1 | | http body的最大允许大小，默认值-1表示无限制 |
+| servicecomb.uploads.maxSize | -1 | | http body的最大允许大小，单位byte，默认值-1表示无限制 |
## Consumer：
