diff --git a/README.md b/README.md
index 0f64971..b2431da 100644
--- a/README.md
+++ b/README.md
@@ -17,17 +17,18 @@ Requirements
 
 Installation
 -------------
-    cordova plugin add cordova-plugin-file-opener2
-    
+    $ cordova plugin add cordova-plugin-file-opener2
+    $ cordova plugin add cordova-plugin-file-opener2  --variable ANDROID_SUPPORT_VERSION={required version}
+
 Usage
 ------
     cordova.plugins.fileOpener2.open(
-        filePath, 
-        fileMIMEType, 
+        filePath,
+        fileMIMEType,
         {
-            error : function(){ }, 
-            success : function(){ } 
-        } 
+            error : function(){ },
+            success : function(){ }
+        }
     );
 
 Examples
@@ -35,21 +36,21 @@ Examples
 Open an APK install dialog:
 
     cordova.plugins.fileOpener2.open(
-        '/sdcard/Download/gmail.apk', 
+        '/sdcard/Download/gmail.apk',
         'application/vnd.android.package-archive'
     );
-    
+
 Open a PDF document with the default PDF reader and optional callback object:
 
     cordova.plugins.fileOpener2.open(
         '/sdcard/Download/starwars.pdf', // You can also use a Cordova-style file uri: cdvfile://localhost/persistent/Download/starwars.pdf
-        'application/pdf', 
-        { 
-            error : function(e) { 
+        'application/pdf',
+        {
+            error : function(e) {
                 console.log('Error status: ' + e.status + ' - Error message: ' + e.message);
             },
             success : function () {
-                console.log('file opened successfully'); 				
+                console.log('file opened successfully');
             }
         }
     );
@@ -58,13 +59,13 @@ Open a system modal to open PDF document with one of the already installed app a
 
     cordova.plugins.fileOpener2.showOpenWithDialog(
         '/sdcard/Download/starwars.pdf', // You can also use a Cordova-style file uri: cdvfile://localhost/persistent/Download/starwars.pdf
-        'application/pdf', 
-        { 
-            error : function(e) { 
+        'application/pdf',
+        {
+            error : function(e) {
                 console.log('Error status: ' + e.status + ' - Error message: ' + e.message);
             },
             success : function () {
-                console.log('file opened successfully'); 				
+                console.log('file opened successfully');
             }
         }
     );
@@ -102,7 +103,7 @@ Uninstall a package with its id.
 
     cordova.plugins.fileOpener2.uninstall('com.zynga.FarmVille2CountryEscape', {
         error : function(e) {
-            console.log('Error status: ' + e.status + ' - Error message: ' + e.message);    
+            console.log('Error status: ' + e.status + ' - Error message: ' + e.message);
         },
         success : function() {
             console.log('Uninstall intent activity started.');
diff --git a/plugin.xml b/plugin.xml
index 2ec207e..38885f7 100644
--- a/plugin.xml
+++ b/plugin.xml
@@ -31,7 +31,8 @@
           </provider>
         </config-file>
         <source-file src="src/android/res/xml/opener_paths.xml" target-dir="res/xml" />
-        <framework src="com.android.support:support-v4:+" />
+        <preference name="ANDROID_SUPPORT_V4_VERSION" default="27.+"/>
+        <framework src="com.android.support:support-v4:$ANDROID_SUPPORT_V4_VERSION"/>
     </platform>
 
     <!-- iOS -->