diff --git a/botalka/src/main/resources/static/openapi/api.yml b/botalka/src/main/resources/static/openapi/api.yml
index 7b29d37..e49cbb8 100644
--- a/botalka/src/main/resources/static/openapi/api.yml
+++ b/botalka/src/main/resources/static/openapi/api.yml
@@ -230,6 +230,12 @@ paths:
             application/json:
               schema:
                 $ref: '#/components/schemas/PromotionRequest'
+        400:
+          description: Invalid parameters
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/GeneralError'
         404:
           description: User not found
           content: