diff --git a/api.py b/api.py
index 14ba956..49877b7 100644
--- a/api.py
+++ b/api.py
@@ -357,6 +357,7 @@ class LigneDevis(BaseModel):
 class DevisRequest(BaseModel):
     client_id: str
     date_devis: Optional[date] = None
+    reference: Optional[str] = None
     lignes: List[LigneDevis]