diff --git a/README.md b/README.md
index 9e1329f..98885a2 100644
--- a/README.md
+++ b/README.md
@@ -401,7 +401,7 @@ $type->defaultSort('-updatedAt,-createdAt');
 To define sort fields with custom logic, or ones that do not correspond to an attribute, use the `sort` method:
 
 ```php
-$type->sort('relevance', function ($query, $direction, ServerRequestInterface $request) {
+$type->sort('relevance', function ($query, string $direction, ServerRequestInterface $request) {
     $query->orderBy('relevance', $direction);
 });
 ```