diff --git a/lectures/flipped/README.md b/lectures/flipped/README.md
index 9884994..18db791 100644
--- a/lectures/flipped/README.md
+++ b/lectures/flipped/README.md
@@ -1,5 +1,3 @@
 Contain notes for flipped classrooms
 
 Solutions to some exercises are provided. Try not to read them if you are working on the exercises for the first time.
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-[ece459prac](https://uofwaterloo-my.sharepoint.com/:x:/r/personal/h365chen_uwaterloo_ca/Documents/ece459prac.xlsx?d=w46d1f7fa6c7e4d4aaab4026d33c13ef0&csf=1&web=1&e=cbezln)