Add note about head.js to readme.

Closes hakimel#1569.
jiharal · Dec 11, 2016 · 4d0f1ad · 4d0f1ad
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diff --git a/README.md b/README.md
@@ -363,6 +363,7 @@ You can add your own extensions using the same syntax. The following properties
 - **callback**: [optional] Function to execute when the script has loaded
 - **condition**: [optional] Function which must return true for the script to be loaded
 
+To load these dependencies, Reveal.js requires [head.js](http://headjs.com/) *(a script loading library)* to be loaded before Reveal.js.
 
 ### Ready Event