diff --git a/docs/guide-zh-CN/concept-properties.md b/docs/guide-zh-CN/concept-properties.md
index 0998981488..ec9fc5f4bb 100644
--- a/docs/guide-zh-CN/concept-properties.md
+++ b/docs/guide-zh-CN/concept-properties.md
@@ -32,7 +32,7 @@ namespace app\components;
 
 use yii\base\BaseObject;
 
-class Foo extend BaseObject
+class Foo extends BaseObject
 {
     private $_label;