diff --git a/12-dev-guide/12-4-4-functions.md b/12-dev-guide/12-4-4-functions.md
index 9d55c93563067c995e5761884de54a94341e484d..27e181c65fdf998cd672712fc7221f0c2291500a 100644
--- a/12-dev-guide/12-4-4-functions.md
+++ b/12-dev-guide/12-4-4-functions.md
@@ -308,7 +308,7 @@ greatsql> SELECT ROUND(1.598588,3);
 +-------------------+
 1 row in set (0.00 sec)
 ```
-若为负数 ROUND(-1.595658,3) 返回-1.599
+若为负数 ROUND(-1.598658,3) 返回-1.599
 ```sql
 greatsql> SELECT ROUND(-1.598588,3);
 +--------------------+