diff --git a/app/schemas/schemas.py b/app/schemas/schemas.py
index 08d4388..57bfec9 100644
--- a/app/schemas/schemas.py
+++ b/app/schemas/schemas.py
@@ -240,6 +240,7 @@ class MilestoneUpdate(BaseModel):
 
 class MilestoneResponse(MilestoneBase):
     id: int
+    milestone_code: Optional[str] = None
     project_id: int
     created_by_id: Optional[int] = None
     started_at: Optional[datetime] = None