diff --git a/documentation/webdocs/markdowndocs/Connector.md b/documentation/webdocs/markdowndocs/Connector.md
index a0433d1f09d7c5f2ec1205f89d2efe638703dc7d..563d306128d5fe27959b67d845aab4ae66988a80 100644
--- a/documentation/webdocs/markdowndocs/Connector.md
+++ b/documentation/webdocs/markdowndocs/Connector.md
@@ -2,6 +2,8 @@
 
 TDengine provides many connectors for development, including C/C++, JAVA, Python, RESTful, Go, Node.JS, etc.
 
+NOTE: All APIs which require a SQL string as parameter, including but not limit to `taos_query`, `taos_query_a`, `taos_subscribe` in the C/C++ Connector and their counterparts in other connectors, can ONLY process one SQL statement at a time. If more than one SQL statements are provided, their behaviors are undefined.
+
 ## C/C++ API
 
 C/C++ APIs are similar to the MySQL APIs. Applications should include TDengine head file _taos.h_ to use C/C++ APIs by adding the following line in code:
diff --git a/documentation/webdocs/markdowndocs/connector-ch.md b/documentation/webdocs/markdowndocs/connector-ch.md
index b5d8fb5afb12ede82f2cdcd9ea29e20e8a82d6b8..47c8381f69c3b582ede9f1ae54ea2da27e6851d1 100644
--- a/documentation/webdocs/markdowndocs/connector-ch.md
+++ b/documentation/webdocs/markdowndocs/connector-ch.md
@@ -2,6 +2,8 @@
 
 TDengine提供了丰富的应用程序开发接口，其中包括C/C++、JAVA、Python、RESTful、Go等，便于用户快速开发应用。
 
+注意：所以执行 SQL 语句的 API，例如 C/C++ Connector 中的 `tao_query`、`taos_query_a`、`taos_subscribe` 等，以及其它语言中与它们对应的API，每次都只能执行一条 SQL 语句，如果实际参数中包含了多条语句，它们的行为是未定义的。
+
 ## C/C++ Connector
 
 C/C++的API类似于MySQL的C API。应用程序使用时，需要包含TDengine头文件 _taos.h_（安装后，位于 _/usr/local/taos/include_）：