diff --git a/readme.md b/readme.md
index 671b1d0..00e4fde 100644
--- a/readme.md
+++ b/readme.md
@@ -28,7 +28,6 @@ class BitFlagBehavior extends Behavior
     public function events()
     {
         return [
-            ActiveRecord::EVENT_INIT => 'eventInit',
             ActiveRecord::EVENT_BEFORE_INSERT => 'beforeSave',
             ActiveRecord::EVENT_BEFORE_UPDATE => 'beforeUpdate',
             ActiveRecord::EVENT_AFTER_FIND => 'afterFind',
@@ -36,24 +35,6 @@ class BitFlagBehavior extends Behavior
         ];
     }
 
-    public function eventInit()
-    {
-        $this->addFlagFieldsToOwner();
-    }
-
-    /**
-     * 添加自定义标志属性
-     */
-    public function addFlagFieldsToOwner()
-    {
-        $owner = $this->owner;
-        $fields = [];
-        foreach ($owner::BIT_FLAGS as $bigFlag) {
-            $fields = ArrayHelper::merge($fields, array_combine($bigFlag, $bigFlag));
-        }
-        $owner->_fields = $fields;
-    }
-
     public function beforeSave()
     {
         foreach ($this->bitFlags as $bitFlag => $flags) {
@@ -159,14 +140,13 @@ class MyModel extends base\MyModel
         // ]
     ];
 
-    /**
-     * @var string[] 自定义标志字段
-     */
-    public $_fields;
-
     public function fields()
     {
-        return ArrayHelper::merge(parent::fields(), $this->_fields);
+        $fields = [];
+        foreach (self::BIT_FLAGS as $bigFlag) {
+            $fields = ArrayHelper::merge($fields, array_combine($bigFlag, $bigFlag));
+        }
+        return ArrayHelper::merge(parent::fields(), $fields);
     }
 
     public function behaviors()