diff --git a/README.md b/README.md
index 1bd0b68d..d7bf60a4 100644
--- a/README.md
+++ b/README.md
@@ -80,7 +80,7 @@ DEMO代码地址：[https://github.com/alibaba/easyexcel/blob/master/src/test/ja
     @GetMapping("download")
     public void download(HttpServletResponse response) throws IOException {
         // 这里注意 有同学反应使用swagger 会导致各种问题，请直接用浏览器或者用postman
-        response.setContentType("vnd.openxmlformats-officedocument.spreadsheetml.sheet");
+        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
         response.setCharacterEncoding("utf-8");
         // 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
         String fileName = URLEncoder.encode("测试", "UTF-8").replaceAll("\\+", "%20");