Updated README.md with instructions on requirements on Windows 7 for OpenAL 1.1.

README.md

@@ -4,8 +4,9 @@ GamePlay is a open-source, cross-platform 3D native gaming framework making it e
 
 Supported platforms
 -------------------
-Microsoft Windows 7 (using Microsoft Visual Studio 2010)
-BlackBerry PlayBook 1.0/2.0 (using BlackBerry Native SDK 1.0)
+- Microsoft Windows 7 (using Microsoft Visual Studio 2010)
+ * Requires OpenAL 1.1 (http://connect.creativelabs.com/openal/Downloads/Forms/AllItems.aspx)
+- BlackBerry PlayBook 1.0/2.0 (using BlackBerry Native SDK 1.0)
 
 Roadmap
 -------