diff --git a/en/device-dev/driver/driver-platform-mipidsi-develop.md b/en/device-dev/driver/driver-platform-mipidsi-develop.md
index 2677bd2c7040ca07c5356d8448d4fdbb2e2e20b3..e853afae8bb2792f154471005e61eb786c254497 100644
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@@ -11,7 +11,7 @@
The Display Serial Interface \(DSI\) is a specification developed by the Mobile Industry Processor Interface \(MIPI\) Alliance to reduce the cost of display controllers in mobile devices. In the Hardware Driver Foundation (HDF) framework, the MIPI-DSI module uses the service-free mode for API adaptation. The service-free mode applies to the devices that do not provide user-mode APIs or the OS system that does not distinguish the user mode and the kernel mode. In the service-free mode, **DevHandle** \(a void pointer\) directly points to the kernel-mode address of the device object.
**Figure 1** Service-free mode
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## How to Develop