diff --git a/src/Libs/Model.php b/src/Libs/Model.php
index 2ed67e7..65d23b6 100644
--- a/src/Libs/Model.php
+++ b/src/Libs/Model.php
@@ -892,14 +892,14 @@ class Model
     /**
      * Defines GROUP BY in the SQL statement.
      *
-     * @param array $arr
+     * @param array $columns
      *                   Columns to group by.
      *
      * @return static
      */
-    public static function groupBy(array $arr): static
+    public static function groupBy(string ...$columns): static
     {
-        static::$querySelect['groupBy'] = join(', ', $arr);
+        static::$querySelect['groupBy'] = join(', ', $columns);
         return new static();
     }