diff --git a/api/openapi.yaml b/api/openapi.yaml
index fd4c5e8..868293b 100644
--- a/api/openapi.yaml
+++ b/api/openapi.yaml
@@ -166,6 +166,7 @@ components:
           type: string
         days:
           type: integer
+          format: int8
           minimum: 1
           maximum: 5
           default: 1