diff --git a/zh-cn/application-dev/reference/arkui-ts/ts-methods-custom-dialog-box.md b/zh-cn/application-dev/reference/arkui-ts/ts-methods-custom-dialog-box.md
index 2455f37d8358291ee204ed57fff3b1fce99e8911..91a807b281bd51dd0cf945435acddbfe5dbee18a 100644
--- a/zh-cn/application-dev/reference/arkui-ts/ts-methods-custom-dialog-box.md
+++ b/zh-cn/application-dev/reference/arkui-ts/ts-methods-custom-dialog-box.md
@@ -37,6 +37,7 @@ CustomDialogController(value:{builder: CustomDialog, cancel?: () => void, aut
 ```ts
 dialogController : CustomDialogController = new CustomDialogController(value:{builder: CustomDialog, cancel?: () => void, autoCancel?: boolean})
 ```
+**说明**：CustomDialogController仅在作为@CustomDialog和@Component struct的成员变量，且在@Component struct内部定义时赋值才有效，具体用法可看下方示例。
 
 ### open()
 open(): void