diff --git a/botalka/src/main/resources/static/openapi/api.yml b/botalka/src/main/resources/static/openapi/api.yml
index e49cbb8..711fb23 100644
--- a/botalka/src/main/resources/static/openapi/api.yml
+++ b/botalka/src/main/resources/static/openapi/api.yml
@@ -271,6 +271,12 @@ paths:
       responses:
         204:
           description: Promotion request resolved
+        400:
+          description: Invalid parameters
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/GeneralError'
         404:
           description: Promotion request not found
           content: