diff --git a/README.md b/README.md
index 58aec19..8db2f8b 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,8 @@ or
 ```javascript
 import ImgToBase64 from 'react-native-image-base64';
 
-ImgToBase64.getBase64String('file://youfileurl', (err, base64string) => doSomethingWith(base64string));
+ImgToBase64.getBase64String('file://youfileurl')
+  .then(base64String => doSomethingWith(base64String))
+  .catch(err => doSomethingWith(err));
 ```
   
\ No newline at end of file