diff --git a/卡券.md b/卡券.md
index 3be4c5e..b8078be 100644
--- a/卡券.md
+++ b/卡券.md
@@ -30,6 +30,14 @@ $card = new Card($appId, $secret);
 + `boolean updateCode($code, $newCode, $cardId)` 更新 code;
 + `boolean disable($code, $cardId = null)` 废弃卡券，失效，将用户的卡券设置为失效状态；
 + `string getRealCode($encryptedCode)` code 解码；
++ `array attachExtension($cardId, array $ext = array())` 返回用于批量添加到卡包的 `card_list` 项, ex:
+
+    ```json
+    {
+        "card_id": "po_2Djks4-yP5PGtgGY4GkbAIIt0",
+        "card_ext": "{\"code\":\"\",\"openid\":\"\",\"timestamp\":\"1402057159\",\"signature\":\"017bb17407c8e 0058a66d72dcc61632b70f511ad\"}"
+    }
+    ```
 
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