diff --git a/taoyao-signal-server/taoyao-signal/src/main/java/com/acgist/taoyao/signal/service/UsernamePasswordService.java b/taoyao-signal-server/taoyao-signal/src/main/java/com/acgist/taoyao/signal/service/UsernamePasswordService.java
index adf2052..79ec52f 100644
--- a/taoyao-signal-server/taoyao-signal/src/main/java/com/acgist/taoyao/signal/service/UsernamePasswordService.java
+++ b/taoyao-signal-server/taoyao-signal/src/main/java/com/acgist/taoyao/signal/service/UsernamePasswordService.java
@@ -3,12 +3,14 @@ package com.acgist.taoyao.signal.service;
 /**
  * 帐号密码认证服务
  * 
+ * 用于验证帐号密码，如果没有提供实现默认使用配置中的帐号密码。
+ * 
  * @author acgist
  */
 public interface UsernamePasswordService {
 
     /**
-     * 认证
+     * 帐号密码认证
      * 
      * @param username 帐号
      * @param password 密码