diff --git a/openapi.json b/openapi.json
index f0f931c..4a714b5 100644
--- a/openapi.json
+++ b/openapi.json
@@ -3992,7 +3992,8 @@
         "type": "apiKey",
         "description": "Authentication with `Authorization` header and `DeepL-Auth-Key` authentication scheme",
         "name": "Authorization",
-        "in": "header"
+        "in": "header",
+        "x-default": "DeepL-Auth-Key "
       }
     },
     "schemas": {
diff --git a/openapi.yaml b/openapi.yaml
index 40c242c..dde633c 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -2759,6 +2759,7 @@ components:
         authentication scheme
       name: Authorization
       in: header
+      x-default: "DeepL-Auth-Key "
   schemas:
     ApiKeyId:
       description: API key ID. Consists of two valid GUIDs separated by a colon.