diff --git a/src/Illuminate/Database/Query/Builder.php b/src/Illuminate/Database/Query/Builder.php
index f87fb455afce..c21123862f1b 100755
--- a/src/Illuminate/Database/Query/Builder.php
+++ b/src/Illuminate/Database/Query/Builder.php
@@ -1989,7 +1989,7 @@ public function orWhereFullText($columns, $value, array $options = [])
     /**
      * Add a "group by" clause to the query.
      *
-     * @param  array|string  ...$groups
+     * @param  array|string|\Illuminate\Contracts\Database\Query\Expression  ...$groups
      * @return $this
      */
     public function groupBy(...$groups)