diff --git a/docs/en-us/tutorial.md b/docs/en-us/tutorial.md
index ec143a4..043d71c 100644
--- a/docs/en-us/tutorial.md
+++ b/docs/en-us/tutorial.md
@@ -77,4 +77,4 @@ List of supported parameters, specific effects can be previewed in the APP.
 | url | URL to jump to when the push is clicked, supports URL Scheme and Universal Link |
 | action | Pass "none" to prevent a popup when the push is clicked |
 | id | When using the same ID value, it will update the corresponding push notification content<br>Requires Bark v1.5.2, bark-server v2.2.5 or above |
-| delete | Pass "1" to delete the notification from the system notification center and APP history, must be used with the id parameter |
\ No newline at end of file
+| delete | Pass "1" to delete the notification from the system notification center and APP history, must be used with the id parameter<br>Requires "Background App Refresh" to be enabled in settings, otherwise it will not work. |
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diff --git a/docs/tutorial.md b/docs/tutorial.md
index 25cd7c4..1017472 100644
--- a/docs/tutorial.md
+++ b/docs/tutorial.md
@@ -77,7 +77,8 @@ curl -X "POST" "https://api.day.app/push" \
 | url | 点击推送时，跳转的URL ，支持URL Scheme 和 Universal Link |
 | action | 传 "none" 时，点击推送不会弹窗 |
 | id | 使用相同的ID值时，将更新对应推送的通知内容<br>需 Bark v1.5.2, bark-server v2.2.5 以上 |
-| delete | 传 "1" 时，将从系统通知中心和APP内历史记录中删除通知，需搭配 id 参数使用 |
+| delete | 传 "1" 时，将从系统通知中心和APP内历史记录中删除通知，需搭配 id 参数使用<br>需在设置里开启”后台App刷新“，否则无效。|
+
 
 ## 快捷指令
 Bark 支持快捷指令直接发送推送，以下是当收到交警短信时，忽略静音模式持续响铃提醒用户的自动化示例。