diff --git a/src/controllers/05-quotation-controller.ts b/src/controllers/05-quotation-controller.ts
index 66765b7..ef7248d 100644
--- a/src/controllers/05-quotation-controller.ts
+++ b/src/controllers/05-quotation-controller.ts
@@ -28,7 +28,7 @@ import { precisionRound } from "../utils/arithmetic";
 type QuotationCreate = {
   registeredBranchId: string;
   status?: Status;
-  remark?: string;
+  remark?: string | null;
 
   workName: string;
   contactName: string;
@@ -80,7 +80,7 @@ type QuotationCreate = {
 type QuotationUpdate = {
   registeredBranchId?: string;
   status?: "ACTIVE" | "INACTIVE";
-  remark?: string;
+  remark?: string | null;
 
   workName?: string;
   contactName?: string;