diff --git a/README.md b/README.md
index 71eea61caa..b188a3e024 100644
--- a/README.md
+++ b/README.md
@@ -88,7 +88,7 @@ You can check [index.js](https://github.com/xgfe/react-native-datepicker/blob/ma
 | is24Hour | - | `boolean` | Set the TimePicker is24Hour flag. The default value depend on `format`. Only work in Android |
 | allowFontScaling | true | `boolean` | Set to false to disable font scaling for every text component |
 | placeholder | '' | `string` | The placeholder show when this.props.date is falsy |
-| onDateChange | - | `function` | This is called when the user confirm the picked date or time in the UI. The first and only argument is a date or time string representing the new date and time formatted by [moment.js](http://momentjs.com/) with the given format property. |
+| onDateChange | - | `function` | This is called when the user confirm the picked date or time in the UI. The first argument `dateStr` is a date or time string representing the new date and time formatted by [moment.js](http://momentjs.com/) with the given format property. The second argument is a `date` that is not formatted.  |
 | onOpenModal | - | `function` | This is called when the DatePicker Modal open. |
 | onCloseModal | - | `function` | This is called when the DatePicker Modal close |
 | onPressMask | - | `function` | This is called when clicking the ios modal mask |