diff --git a/CMU15445数据库系统设计/fall2020-WangAShao.md b/CMU15445数据库系统设计/fall2020-WangAShao.md
index d720772..d83d226 100644
--- a/CMU15445数据库系统设计/fall2020-WangAShao.md
+++ b/CMU15445数据库系统设计/fall2020-WangAShao.md
@@ -6,7 +6,7 @@
 
 - [x] [Project x 4 & HomeWork x 5](https://15445.courses.cs.cmu.edu/fall2020/assignments.html)
 - [x] [AutoGrader](https://www.gradescope.com/courses/195440) 
-- [x] Vedios [bilibili](https://www.bilibili.com/video/BV1q741127SQ), [youtube](https://www.youtube.com/watch?v=oeYBdghaIjc), [simviso中文翻译-付费](https://www.simtoco.com/#/albums?id=1000013)
+- [x] Videos [bilibili](https://www.bilibili.com/video/BV1q741127SQ), [youtube](https://www.youtube.com/watch?v=oeYBdghaIjc), [simviso中文翻译-付费](https://www.simtoco.com/#/albums?id=1000013)
 - [x] [Complete Notes & Slides](https://15445.courses.cs.cmu.edu/fall2020/schedule.html#)
 
 ## 课程信息