diff --git a/en/application-dev/reference/arkui-ts/ts-methods-custom-dialog-box.md b/en/application-dev/reference/arkui-ts/ts-methods-custom-dialog-box.md
index 56ebc03a81c7873468f9164e8b7ab90e8de70571..0f15335b6b4ba61a18b6ebe632e08a6f7fd7ea2c 100644
--- a/en/application-dev/reference/arkui-ts/ts-methods-custom-dialog-box.md
+++ b/en/application-dev/reference/arkui-ts/ts-methods-custom-dialog-box.md
@@ -37,6 +37,9 @@ CustomDialogController(value:{builder: CustomDialog, cancel?: () => void, aut
 ```ts
 dialogController : CustomDialogController = new CustomDialogController(value:{builder: CustomDialog, cancel?: () => void, autoCancel?: boolean})
 ```
+> **NOTE**
+> 
+> **CustomDialogController** is valid only when it is a member variable of the **@CustomDialog** and **@Component** decorated struct and is defined in the **@Component** decorated struct. For details, see the following example.
 
 ### open()
 open(): void