Update README.md

README.md

@@ -40,4 +40,6 @@ use [zt-zip](<https://github.com/zeroturnaround/zt-zip>) for unzip xapk,thanks
 
 Because Meizu and vivo have modified the system installation-related classes,xapk(split apk) cannot be successfully installed, so check it and do nothing if os is flyme or funtouch os.
 
+According to #issue 3,you need close miui optimization in setting if you use miui,otherwise the installation will fail;
+
 In addition, please refer to the article：https://www.jianshu.com/p/580b61ee7aee