add example for parallax backgrounds

diff --git a/README.md b/README.md
index 7cac95ce3255b54f8d210f7c30136fc45f3b36bf..6a4961a6e1d91c02adb07f8e5484744ad9592aee 100644 (file)
--- a/README.md
+++ b/README.md
@@ -388,7 +388,7 @@ Reveal.initialize({
 });
 ```
 
-Make sure that the background size is much bigger than screen size to allow for some scrolling.
+Make sure that the background size is much bigger than screen size to allow for some scrolling. [View example](http://lab.hakim.se/reveal-js/?parallaxBackgroundImage=https%3A%2F%2Fs3.amazonaws.com%2Fhakim-static%2Freveal-js%2Freveal-parallax-1.jpg&parallaxBackgroundSize=2100px%20900px).