diff --git a/docs/guide/db-query-builder.md b/docs/guide/db-query-builder.md
index 11a12661c6..81966d2660 100644
--- a/docs/guide/db-query-builder.md
+++ b/docs/guide/db-query-builder.md
@@ -383,7 +383,7 @@ If `GROUP BY` only involves simple column names, you can specify it using a stri
 raw SQLs. For example,
 
 ```php
-$query->groupBy('id, status']);
+$query->groupBy('id, status');
 ```
 
 > Note: You should use the array format if `GROUP BY` involves some DB expression.