diff --git a/CommandHandler.cs b/CommandHandler.cs
index 3064568..98d0f01 100644
--- a/CommandHandler.cs
+++ b/CommandHandler.cs
@@ -8,7 +8,7 @@ namespace DualScreenDemo
     public class CommandHandler
     {
         public static bool readyForSongListInput = false;
-        private readonly int _maxHistoryLength = 6; // 最多保留 100 筆
+        private readonly int _maxHistoryLength = 6; // 最多保留 6 筆
         private readonly Queue<string> _indataHistory = new Queue<string>();
         private readonly SongListManager songListManager;
 
@@ -891,20 +891,6 @@ private static void DisplaySongHistory()
             }
         }
 
-        public static bool CheckLogForShutdown(string filePath)
-        {
-            if (File.Exists(filePath))
-            {
-                
-                string content = File.ReadAllText(filePath).Replace(Environment.NewLine, "");
-                if (content.Length >= 6 && content.Substring(content.Length - 6) == "bbbaaa")
-                {
-                    return true;
-                }
-            }
-            return false;
-        }
-
         public static void ShutdownComputer()
         {
             try