diff --git a/README.md b/README.md
index fdfb2c8ad43068f9e89741d5c3021694f1d5badc..cdfc123ec650b04a2ca68c1b4f58aaf9d9db0dba 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ Before data is transferred, the distributed service checks whether the security
 | ---------------- | --------- | --------- | --------- | --------- | --------- |
 | **Data Risk Level**| **S0 to S4** | **S0 to S4** | **S0 to S3** | **S0 to S2** | **S0 to S1** |
 
-The distributed service blocks data transmission based on the data risk level returned by the data transfer management module. Before data transmission is denied, a dialog box can be displayed to ask for user's permission. Data can be transferred if the user allows. The device vendors can implement the authorization mechanism.
+If the device security level does not match the data risk level returned by the data transfer management module, the distributed service blocks data transmisison by default. However, you can use a dialog box to ask for user's permission. Data can be transferred if the user allows. The device vendors can implement the authorization mechanism.
 
 
 ## Directory Structure<a name="section161941989596"></a>
@@ -43,8 +43,8 @@ The distributed service blocks data transmission based on the data risk level re
 
 | API                                                      | Description                                  |
 | ------------------------------------------------------------ | -------------------------------------- |
-| int32_t DATASL_GetHighestSecLevel(DEVSLQueryParams *queryParams, uint32_t *levelInfo); | Obtains the data risk levels supported by the device.    |
-| int32_t DATASL_GetHighestSecLevelAsync(DEVSLQueryParams *queryParams, HigestSecInfoCallback *callback); | Asynchronously obtains the data risk levels supported by the device.|
+| int32_t DATASL_GetHighestSecLevel(DEVSLQueryParams *queryParams, uint32_t *levelInfo); | Obtains the highest data risk level supported by the device.    |
+| int32_t DATASL_GetHighestSecLevelAsync(DEVSLQueryParams *queryParams, HigestSecInfoCallback *callback); | Asynchronously obtains the highest data risk level supported by the device.|
 | int32_t DATASL_OnStart(void);                                | Starts initialization.                          |
 | void DATASL_OnStop(void);                                    | Stops initialization.                        |