diff --git a/specifications/petstore.yaml b/specifications/petstore.yaml
index c896cf7..e0b35c3 100644
--- a/specifications/petstore.yaml
+++ b/specifications/petstore.yaml
@@ -673,6 +673,7 @@ components:
             type: array
             items:
               "$ref": "#/components/schemas/User"
+            minItems: 1
       description: List of user object
       required: true
   securitySchemes: