diff --git a/Day01-15/code/Day07/marquee.py b/Day01-15/code/Day07/marquee.py
index 9d6f546..8c2c4a6 100644
--- a/Day01-15/code/Day07/marquee.py
+++ b/Day01-15/code/Day07/marquee.py
@@ -1,5 +1,5 @@
 """
-输入学生考试成绩计算平均分
+滚动弹幕
 
 Version: 0.1
 Author: 骆昊
@@ -12,12 +12,16 @@ import time
 
 def main():
     str = 'Welcome to 1000 Phone Chengdu Campus      '
+    counter = 0
     while True:
         print(str)
+        counter += 1
         time.sleep(0.2)
         str = str[1:] + str[0:1]
         # for Windows use os.system('cls') instead
         os.system('clear')
+        if counter == 100:
+            break
 
 
 if __name__ == '__main__':