diff --git a/demo.py b/demo.py
index 286259a..526867d 100644
--- a/demo.py
+++ b/demo.py
@@ -110,6 +110,12 @@ class HandDetector:
         return self.lmList, bbox_info
 
     def revolve(self, img, draw=True):
+        """
+            旋转手势识别点
+            :param img: 要查找的主图像
+            :param draw: 在图像上绘制输出的标志。(默认绘制矩形框)
+            :return: 像素格式的手部关节位置列表
+        """
         # print(self.lmList)
         point_x = self.lmList[0][0]
         point_y = self.lmList[0][1]