diff --git a/content/self-host/pro/_index.en.md b/content/self-host/pro/_index.en.md
index b4f6842..cd59410 100644
--- a/content/self-host/pro/_index.en.md
+++ b/content/self-host/pro/_index.en.md
@@ -23,7 +23,7 @@ Administrators can `Enable` or `Disable` different strategies as needed. By defa
 
 Each device can only be managed by one strategy. Administrators can change the management strategy of a device by the `Edit Devices` option. By default, all devices use the default strategy. Administrators can add or delete devices and change their management strategies. If a device is deleted, it will be managed by the default strategy again.
 
-In the device management interface, the left-hand area is used to filter devices, and the devices selected in the right-hand column will be managed by the current strategy.
+In the device management interface, the left-hand area is used to filter devices, and the devices selected in the right-hand column will be managed by the current strategy. Devices that are not logged in will be displayed in the `null` group.
 
 ![](/docs/en/self-host/pro/images/edit_devices.png)
 
@@ -35,6 +35,6 @@ Each device can only be managed by one strategy, and if that strategy is disable
 * If the administrator changes the strategy content, the client's options will be synchronized.
 * If the administrator changes the strategy to which the device belongs, the client's options will be synchronized.
 
-### Edit Strategy
+### Edit Strategies
 
-At the bottom of the strategy, click `Edit`, make modifications and click `Submit`. The strategy will be synchronized to devices within 1 minute.
\ No newline at end of file
+At the bottom of the strategy, click `Edit`, make modifications and click `Submit`. The strategy will be synchronized to devices within 30 seconds.
\ No newline at end of file
diff --git a/content/self-host/pro/_index.zh-cn.md b/content/self-host/pro/_index.zh-cn.md
index e8927fe..96c22e3 100644
--- a/content/self-host/pro/_index.zh-cn.md
+++ b/content/self-host/pro/_index.zh-cn.md
@@ -22,7 +22,7 @@ RustDesk 提供了一个默认策略，管理员可以在此基础上进行修
 ### 管理设备
 
 每个设备只能被一种策略管理。管理员可以通过`编辑设备`来更改设备的管理策略。默认情况下，所有设备都使用默认策略。管理员可以通过添加或删除设备，更改设备的管理策略。如果设备被删除，它将重新被默认策略管理。
-在设备管理界面中，左侧区域用于筛选设备，右侧列中被选中的设备将会受到当前策略的管理。
+在设备管理界面中，左侧区域用于筛选设备，右侧列中被选中的设备将会受到当前策略的管理。未登录的设备将会显示在`null`组中。
 
 ![](/docs/en/self-host/pro/images/edit_devices.png)
 
@@ -35,4 +35,5 @@ RustDesk 提供了一个默认策略，管理员可以在此基础上进行修
 
 ### 修改策略
 
-在策略底部，点击`编辑`，完成修改后点击`提交`。策略将在1分钟内同步到设备。
+在策略底部，点击`编辑`，完成修改后点击`提交`。策略将在30秒内同步到设备。
+