diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/util/MapUtil.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/util/MapUtil.java
index b25d6f02..acd13f81 100644
--- a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/util/MapUtil.java
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/util/MapUtil.java
@@ -29,8 +29,6 @@ public class MapUtil {
 	 *            是否编码
 	 * @param lowerCase
 	 *            是否转换小写
-	 * @param extra
-	 *            附加对象
 	 * @return
 	 */
 	public static String toJoinString(Object object, boolean encoder,