diff --git a/framework/assets/yii.js b/framework/assets/yii.js
index 3a23763..1e847c4 100644
--- a/framework/assets/yii.js
+++ b/framework/assets/yii.js
@@ -7,24 +7,59 @@
  * @author Qiang Xue <qiang.xue@gmail.com>
  * @since 2.0
  */
+
+/**
+ * yii is the root module for all Yii JavaScript modules.
+ * It implements a mechanism of organizing JavaScript code in modules through the function "yii.initModule()".
+ *
+ * Each module should be named as "x.y.z", where "x" stands for the root module (for the Yii core code, this is "yii").
+ *
+ * A module may be structured as follows:
+ *
+ * ~~~
+ * yii.sample = (function($) {
+ *     var pub = {
+ *         // whether this module is currently active. If false, init() will not be called for this module
+ *         // it will also not be called for all its child modules. If this property is undefined, it means true.
+ *         isActive: true,
+ *         init: function() {
+ *             // ... module initialization code go here ...
+ *         },
+ *
+ *         // ... other public functions and properties go here ...
+ *     };
+ *
+ *     // ... private functions and properties go here ...
+ *
+ *     return pub;
+ * });
+ * ~~~
+ *
+ * Using this structure, you can define public and private functions/properties for a module.
+ * Private functions/properties are only visible within the module, while public functions/properties
+ * may be accessed outside of the module. For example, you can access "yii.sample.init()".
+ *
+ * You must call "yii.initModule()" once for the root module of all your modules.
+ */
 yii = (function ($) {
 	var pub = {
-		version: '2.0'
+		version: '2.0',
+		initModule: function (module) {
+			if (module.isActive === undefined || module.isActive) {
+				if ($.isFunction(module.init)) {
+					module.init();
+				}
+				$.each(module, function () {
+					if ($.isPlainObject(this)) {
+						pub.initModule(this);
+					}
+				});
+			}
+		}
 	};
 	return pub;
 })(jQuery);
 
-jQuery(document).ready(function ($) {
-	// call the init() method of every module
-	var init = function (module) {
-		if ($.isFunction(module.init) && (module.trigger == undefined || $(module.trigger).length)) {
-			module.init();
-		}
-		$.each(module, function () {
-			if ($.isPlainObject(this)) {
-				init(this);
-			}
-		});
-	};
-	init(yii);
+jQuery(document).ready(function () {
+	yii.initModule(yii);
 });
diff --git a/framework/assets/yii.validation.js b/framework/assets/yii.validation.js
index 118ad00..5ca8e4e 100644
--- a/framework/assets/yii.validation.js
+++ b/framework/assets/yii.validation.js
@@ -1,7 +1,7 @@
 /**
  * Yii validation module.
  *
- * This is the JavaScript widget used by the yii\widgets\ActiveForm widget.
+ * This JavaScript module provides the validation methods for the built-in validaotrs.
  *
  * @link http://www.yiiframework.com/
  * @copyright Copyright (c) 2008 Yii Software LLC