diff --git a/api.py b/api.py
index 49877b7..248b481 100644
--- a/api.py
+++ b/api.py
@@ -564,6 +564,7 @@ class DevisUpdateRequest(BaseModel):
     """Modèle pour modification d'un devis existant"""
 
     date_devis: Optional[date] = None
+    reference: Optional[str] = None
     lignes: Optional[List[LigneDevis]] = None
     statut: Optional[int] = Field(None, ge=0, le=6)
 
@@ -571,6 +572,7 @@ class DevisUpdateRequest(BaseModel):
         json_schema_extra = {
             "example": {
                 "date_devis": "2024-01-15",
+                "reference": "DEV-001",
                 "lignes": [
                     {
                         "article_code": "ART001",