Update README.md

Author: compulim

README.md

@@ -2,7 +2,7 @@
 
 [![npm version](https://badge.fury.io/js/react-scroll-to-bottom.svg)](https://badge.fury.io/js/react-scroll-to-bottom) [![Build Status](https://travis-ci.org/compulim/react-scroll-to-bottom.svg?branch=master)](https://travis-ci.org/compulim/react-scroll-to-bottom)
 
-React container that will auto scroll to bottom if new content is added and viewport is at the bottom, similar to `tail -f`. Otherwise, a "jump to bottom" button will be shown to allow user to quickly jump to bottom.
+React container that will auto scroll to bottom or top if new content is added and viewport is at the bottom, similar to `tail -f`. Otherwise, a "jump to bottom" button will be shown to allow user to quickly jump to bottom.
 
 This project scaffolding is from [react-component-template](https://github.com/compulim/react-component-template).