diff --git a/document_examples_test.go b/document_examples_test.go
index 33d89868..267e0e15 100644
--- a/document_examples_test.go
+++ b/document_examples_test.go
@@ -700,9 +700,12 @@ components:
           $ref: './models/product.yaml'
         customer:
           $ref: 'https://example.com/schemas/customer.yaml'
+        warehouse:
+          $ref: 'https://example.com/schemas/warehouse.yaml#/components/schemas/Warehouse'
       required:
         - id
         - product
+        - warehouse
     Pet:
       $ref: './models/pet.yaml'
     ErrorResponse: