diff --git a/backend/app/schemas/tenant.py b/backend/app/schemas/tenant.py
index cd2b5f7..7f5b15e 100644
--- a/backend/app/schemas/tenant.py
+++ b/backend/app/schemas/tenant.py
@@ -33,6 +33,7 @@ class TenantCreate(TenantBase):
 
 
 class TenantUpdate(BaseModel):
+    prefix: Optional[str] = None
     name: Optional[str] = None
     name_eng: Optional[str] = None
     tax_id: Optional[str] = None