diff --git a/lib/scope.js b/lib/scope.js
index 3094cc97..c1e6a51d 100644
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -24,6 +24,17 @@ function defineScope(cls, targetClass, name, params, methods) {
     Object.defineProperty(cls, name, {
         enumerable: false,
         configurable: true,
+        /**
+         * This defines a property for the scope. For example, user.accounts or
+         * User.vips. Please note the cls can be the model class or prototype of
+         * the model class.
+         *
+         * The property value is function. It can be used to query the scope,
+         * such as user.accounts(condOrRefresh, cb) or User.vips(cb). The value
+         * can also have child properties for create/build/delete. For example,
+         * user.accounts.create(act, cb).
+         *
+         */
         get: function () {
             var f = function caller(condOrRefresh, cb) {
                 var actualCond = {};
@@ -84,7 +95,9 @@ function defineScope(cls, targetClass, name, params, methods) {
 
     // Wrap the property into a function for remoting
     var fn = function() {
+        // primaryObject.scopeName, such as user.accounts
         var f = this[name];
+        // set receiver to be the scope property whose value is a function
         f.apply(this[name], arguments);
     };