diff --git a/src/main/java/chanjarster/weixin/api/WxConsts.java b/src/main/java/chanjarster/weixin/api/WxConsts.java
index 4dc9b6c94..dbec083e4 100644
--- a/src/main/java/chanjarster/weixin/api/WxConsts.java
+++ b/src/main/java/chanjarster/weixin/api/WxConsts.java
@@ -17,6 +17,7 @@ public class WxConsts {
   public static final String XML_MSG_LOCATION = "location";
   public static final String XML_MSG_LINK = "link";
   public static final String XML_MSG_EVENT = "event";
+  public static final String XML_TRANSFER_CUSTOMER_SERVICE = "transfer_customer_service";
   
   ///////////////////////
   // 客服消息的消息类型