From 3ad4320f61b42c1957cfeb9442347fec1d06e113 Mon Sep 17 00:00:00 2001
From: Hakim El Hattab <hakim.elhattab@gmail.com>
Date: Sun, 27 Oct 2013 16:39:20 -0400
Subject: [PATCH] documentation for iframe post messages

---
 README.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/README.md b/README.md
index f08ba78..f14be65 100644
--- a/README.md
+++ b/README.md
@@ -493,6 +493,8 @@ Add `data-autoplay` to your media element if you want it to automatically start
 <video data-autoplay src="http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"></video>
 ```
 
+Additionally the framework automatically pushes two [post messages](https://developer.mozilla.org/en-US/docs/Web/API/Window.postMessage) to all iframes, ```slide:start``` when the slide containing the iframe is made visible and ```slide:stop``` when it is hidden.
+
 
 ### Stretching elements
 Sometimes it's desirable to have an element, like an image or video, stretch to consume as much space as possible within a given slide. This can be done by adding the ```.stretch``` class to an element as seen below: