update readme file.

README.md

@@ -22,8 +22,6 @@ The process may take a long time, please wait. For further installation instruct
 
 **2.** Install UX SDK with CocoaPods in the Project
 
-**Important Note:** Please be sure to integrate the contents of Sample Code/DJIWidget into your project if you are not using our sample code template or are upgrading to 4.7 for the first time. Follow the Build Phases settings of either sample code project in this repo for the best result. You must then remove the ios-videopreviewer project if you were using it previously.
-
 Run the following command in the **ObjcSampleCode** and **SwiftSampleCode** paths:
 
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@@ -63,6 +61,12 @@ In both cases developers will still need to update the [Bundle Identifier](http:
 
 One of DJI's aircraft or handheld cameras will be required to run the sample application.  
 
+### DJIWidget Integration
+
+In iOS SDK 4.7, we have replaced the **VideoPreviewer** with **DJIWidget** for video decoding. Please be sure to integrate the contents of **DJIWidget** into your project if you are not using our sample code template or are upgrading to 4.7 for the first time. 
+
+Follow the Build Phases settings of either sample code project in this repo for the best result. You must then remove the **VideoPreviewer** project if you were using it previously.
+
 ## Learn More about DJI UX SDK
 
 Please visit [UX SDK Introduction](http://developer.dji.com/mobile-sdk/documentation/introduction/ux_sdk_introduction.html) for more details.