diff --git a/README.md b/README.md
index 1c55623..c1f934f 100644
--- 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