diff --git a/documentation/webdocs/markdowndocs/Connector.md b/documentation/webdocs/markdowndocs/Connector.md
index 91ac6e58c7d2871a9b4182afb4cba72c27402a39..1b1b3d5b19174906570aa10e4854bc0b3d8dac11 100644
--- a/documentation/webdocs/markdowndocs/Connector.md
+++ b/documentation/webdocs/markdowndocs/Connector.md
@@ -148,7 +148,7 @@ For the time being, TDengine supports subscription on one table. It is implement
   The API used to get the number of fields in a row.
 
 
-- `TAOS_FIELD *taos_fetch_subfields(TAOS_RES *res)`
+- `TAOS_FIELD *taos_fetch_subfields(TAOS_SUB *tsub)`
   The API used to get the description of each column.
 
 ##  Java Connector