diff --git a/OAS3.yml b/OAS3.yml
index 47710e3..6db74eb 100644
--- a/OAS3.yml
+++ b/OAS3.yml
@@ -93,6 +93,9 @@ components:
                 type: string
               message:
                 type: string
+              "type":
+                type: string
+                enum: ["ERR", "WARN"]
   responses:
     AuthenticationRequired:
       description: Authentication is required (401)