diff --git a/docs/en/docs/sql-manual/sql-functions/date-time-functions/str_to_date.md b/docs/en/docs/sql-manual/sql-functions/date-time-functions/str_to_date.md
index c126ccd70a..07cca843ec 100644
--- a/docs/en/docs/sql-manual/sql-functions/date-time-functions/str_to_date.md
+++ b/docs/en/docs/sql-manual/sql-functions/date-time-functions/str_to_date.md
@@ -31,7 +31,7 @@ under the License.
 `DATETIME STR TWO DATES (VARCHAR STR, VARCHAR format)`
 
 
-Convert STR to DATE type by format specified, if the conversion result does not return NULL
+Convert STR to DATE type by format specified, if the conversion result does not return NULL. Note that the 'format' parameter specifies the format of the first parameter.
 
 The `format` supported is consistent with [date_format](date_format.md)
 
diff --git a/docs/zh-CN/docs/sql-manual/sql-functions/date-time-functions/str_to_date.md b/docs/zh-CN/docs/sql-manual/sql-functions/date-time-functions/str_to_date.md
index 53fbf781e6..b9b5619f04 100644
--- a/docs/zh-CN/docs/sql-manual/sql-functions/date-time-functions/str_to_date.md
+++ b/docs/zh-CN/docs/sql-manual/sql-functions/date-time-functions/str_to_date.md
@@ -30,7 +30,7 @@ under the License.
 
 `DATETIME STR_TO_DATE(VARCHAR str, VARCHAR format)`
 
-通过format指定的方式将str转化为DATE类型，如果转化结果不对返回NULL
+通过format指定的方式将str转化为DATE类型，如果转化结果不对返回NULL。注意format指定的是第一个参数的格式。
 
 支持的format格式与[date_format](date_format.md)一致