diff --git a/package.json b/package.json
index 045f09e..041567b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cordova-plugin-mediapicker-dmcbig",
-  "version": "2.2.1",
+  "version": "2.2.2",
   "description": "android ios mediaPicker support selection of multiple image and video",
   "cordova": {
     "id": "cordova-plugin-mediapicker-dmcbig",
diff --git a/plugin.xml b/plugin.xml
index 1ccaec7..03dd4c1 100644
--- a/plugin.xml
+++ b/plugin.xml
@@ -1,12 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
 
-<plugin xmlns="http://apache.org/cordova/ns/plugins/1.0" xmlns:android="http://schemas.android.com/apk/res/android" id="cordova-plugin-mediapicker-dmcbig" version="2.2.0">
+<plugin xmlns="http://apache.org/cordova/ns/plugins/1.0" xmlns:android="http://schemas.android.com/apk/res/android" id="cordova-plugin-mediapicker-dmcbig" version="2.2.2">
   <name>MediaPicker</name>
   <js-module name="MediaPicker" src="www/MediaPicker.js">
     <clobbers target="window.MediaPicker"/>
   </js-module>
 
-  <preference name="IOS_PhotoLibraryUsageDescription" />
+  <preference name="IOS_PHOTO_LIBRARY_USAGE_DESCRIPTION" />
 
   <platform name="android">
     <config-file parent="/*" target="res/xml/config.xml">
@@ -52,7 +52,7 @@
     <resource-file src="src/ios/DMCMediaPicker/zh-Hans.lproj"/>
 
     <config-file target="*-Info.plist" parent="NSPhotoLibraryUsageDescription">
-      <string>$IOS_PhotoLibraryUsageDescription</string>
+      <string>$IOS_PHOTO_LIBRARY_USAGE_DESCRIPTION</string>
     </config-file>  
   </platform>
 </plugin>
diff --git a/readme.md b/readme.md
index 4e552e8..e6db2cc 100644
--- a/readme.md
+++ b/readme.md
@@ -10,7 +10,7 @@ How do I use?
 use npm:
 
 ```npm
-  cordova plugin add cordova-plugin-mediapicker-dmcbig --variable IOS_PhotoLibraryUsageDescription="your usage message"
+  cordova plugin add cordova-plugin-mediapicker-dmcbig --variable IOS_PHOTO_LIBRARY_USAGE_DESCRIPTION=your usage message
 ```
 <font color="#660000">IOS: please use XCode 9</font></br>