diff --git a/src/Illuminate/Database/Query/Builder.php b/src/Illuminate/Database/Query/Builder.php
index ed13026725ce..d2b97d5d121e 100755
--- a/src/Illuminate/Database/Query/Builder.php
+++ b/src/Illuminate/Database/Query/Builder.php
@@ -1101,7 +1101,7 @@ public function orWhereColumn($first, $operator = null, $second = null)
     /**
      * Add a raw where clause to the query.
      *
-     * @param  string  $sql
+     * @param  \Illuminate\Contracts\Database\Query\Expression|string  $sql
      * @param  mixed  $bindings
      * @param  string  $boolean
      * @return $this