diff --git a/documentation20/webdocs/markdowndocs/insert-ch.md b/documentation20/webdocs/markdowndocs/insert-ch.md
index c4eb6e39eb..e9dc4bb2fa 100644
--- a/documentation20/webdocs/markdowndocs/insert-ch.md
+++ b/documentation20/webdocs/markdowndocs/insert-ch.md
@@ -89,6 +89,7 @@ remote_write:
 ### 查询prometheus写入数据
 prometheus产生的数据格式如下：
 ```
+{
 Timestamp: 1576466279341,
 Value: 37.000000, 
 apiserver_request_latencies_bucket {