add note about external markdown in readme (#329)

diff --git a/README.md b/README.md
index 4375933e8400209b4bdc2eb36b5d073a705e720c..22216dac9d35d1e719b8523fb436afd8d6a72db9 100644 (file)
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ Markup heirarchy needs to be ``<div class="reveal"> <div class="slides"> <sectio
 
 It's possible to write your slides using Markdown. To enable Markdown, add the ```data-markdown``` attribute to your ```<section>``` elements and wrap the contents in a ```<script type="text/template">``` like the example below.
 
-This is based on [data-markdown](https://gist.github.com/1343518) from [Paul Irish](https://github.com/paulirish) which in turn uses [showdown](https://github.com/coreyti/showdown/). This is sensitive to indentation (avoid mixing tabs and spaces) and line breaks (avoid consecutive breaks).
+This is based on [data-markdown](https://gist.github.com/1343518) from [Paul Irish](https://github.com/paulirish) which in turn uses [showdown](https://github.com/coreyti/showdown/). Sensitive to indentation (avoid mixing tabs and spaces) and line breaks (avoid consecutive breaks).
 
 ```html
 <section data-markdown>