diff --git a/center.md b/center.md
index 797665699..f831b233d 100644
--- a/center.md
+++ b/center.md
@@ -8,7 +8,7 @@
   - #4 https://www.youtube.com/watch?v=NdH3XeKbhvQ
   - #5 https://www.youtube.com/watch?v=mXG4p5cuR3g
   - #6 https://www.youtube.com/watch?v=h6D7MGLs4Po
-  - #7 https://anagora.org/center
+  - #7 https://www.youtube.com/watch?v=UhK6T9ReRwI
   - #8 https://anagora.org/center
   - #9 https://anagora.org/center
   - #10 https://anagora.org/center