diff --git a/Ink Canvas/MainWindow_cs/MW_TouchEvents.cs b/Ink Canvas/MainWindow_cs/MW_TouchEvents.cs
index 69c1441c..cd33bcff 100644
--- a/Ink Canvas/MainWindow_cs/MW_TouchEvents.cs	
+++ b/Ink Canvas/MainWindow_cs/MW_TouchEvents.cs	
@@ -25,7 +25,9 @@ namespace Ink_Canvas
         private DateTime lastTouchDownTime = DateTime.MinValue;
         private const double MULTI_TOUCH_DELAY_MS = 100; 
         private bool isInWritingMode = false;
-        private bool isMultiTouchTimerActive = false; 
+        private bool isMultiTouchTimerActive = false;
+        
+        /// </summary> 
         /// 保存画布上的非笔画元素（如图片、媒体元素等）
         /// </summary>
         private List<UIElement> PreserveNonStrokeElements()