diff --git a/app/schemas/schemas.py b/app/schemas/schemas.py
index 349df31..be8a6e5 100644
--- a/app/schemas/schemas.py
+++ b/app/schemas/schemas.py
@@ -211,6 +211,7 @@ class MilestoneBase(BaseModel):
 
 
 class MilestoneCreate(MilestoneBase):
+    project_id: int
     pass