diff --git a/src/languageSwitch.java b/src/languageSwitch.java
index d793c4d..ee6475a 100644
--- a/src/languageSwitch.java
+++ b/src/languageSwitch.java
@@ -1,12 +1,15 @@
 public class LanguageSwitch {
 
+  /**
+   * 工具类：负责转换等级语言。
+   */
   //等级转中文输出
   public static String levelToChinese(Login.Level l) {
     return switch (l) {
       case PRIMARY -> "小学";
       case MIDDLE -> "初中";
       case HIGH -> "高中";
-      //default -> "未知";
+      default -> "未知";
     };
   }
 
diff --git a/src/login.java b/src/login.java
index 78a20b4..8f35fa8 100644
--- a/src/login.java
+++ b/src/login.java
@@ -5,6 +5,9 @@ import java.util.Scanner;
 
 public class Login {
 
+  /**
+   * 登录程序
+   */
   public static class Account {
 
     String username;//用户名