Update comment for autoloader

qa-include/qa-base.php

@@ -29,8 +29,17 @@
 	define('QA_BUILD_DATE', '2014-03-20');
 
 
-//	Autoloader for Q2A classes
-
+	/*
+	 * Autoloads some Q2A classes so it's possible to use them without adding a require_once first. From version 1.7 onwards.
+	 * These loosely follow PHP-FIG's PSR-0 standard where faux namespaces are separated by underscores. This is being done
+	 * slowly and carefully to maintain backwards compatibility, and does not apply to plugins, themes, nor most of the core
+	 * for that matter.
+	 *
+	 * Classes are stored in the qa-include/Q2A folder, and then in subfolders depending on their categorization.
+	 * Class names should be of the form Q2A_<Namespace>_<Class>, e.g. Q2A_Util_Debug. There may be multiple "namespaces".
+	 * Classes are mapped to PHP files with the underscores converted to directory separators. The Q2A_Util_Debug class is in
+	 * the file qa-include/Q2A/Util/Debug.php. A class named Q2A_Db_User_Messages would be in a file qa-include/Q2A/Db/User/Messages.php.
+	 */
 	function qa_autoload($class)
 	{
 		if (strpos($class, 'Q2A_') === 0)