diff --git a/src/teaching/cse-562/2017sp/index.erb b/src/teaching/cse-562/2017sp/index.erb
index 9a619bb1..92130d92 100644
--- a/src/teaching/cse-562/2017sp/index.erb
+++ b/src/teaching/cse-562/2017sp/index.erb
@@ -113,6 +113,7 @@ classContent:
     topic: Transaction Control Protocols (Optimistic Concurrency)
     meta:
       slides: slides/2017-04-13-OptimisticConcurrency.pdf
+      video: https://youtu.be/mtT9sQIFuuM
   - date: Apr. 18
     topic: Logging and Aries
     meta: