diff --git a/en/application-dev/connectivity/ipc-rpc-development-guideline.md b/en/application-dev/connectivity/ipc-rpc-development-guideline.md
index a6fcb7226b83ae4b4e8aaf82d1fa84bd1291001e..03019858805cff17ef97b4c7227ee5c86947536b 100644
--- a/en/application-dev/connectivity/ipc-rpc-development-guideline.md
+++ b/en/application-dev/connectivity/ipc-rpc-development-guideline.md
@@ -46,7 +46,7 @@ IPC/RPC enables a proxy and a stub that run on different processes to communicat
 
 1.  Define the IPC interface **ITestAbility**.
 
-   **ITestAbility** inherits the IPC base class **IRemoteBroker** and defines descriptors, functions, and message code. The functions need to be implemented on both the proxy and stub.
+    **ITestAbility** inherits the IPC base class **IRemoteBroker** and defines descriptors, functions, and message code. The functions need to be implemented on both the proxy and stub.
 
     ```
     class ITestAbility : public IRemoteBroker {