diff --git a/unit05_key_exchange/README.md b/unit05_key_exchange/README.md
index 7de86a7..22974c6 100644
--- a/unit05_key_exchange/README.md
+++ b/unit05_key_exchange/README.md
@@ -12,6 +12,7 @@ What you should know at the end of unit?
 
 * Week 5 Presentation (lecture - Part 1) - Key Exchange: [here](https://github.com/billbuchanan/appliedcrypto/edit/main/unit05_key_exchange/lecture)
 * Week 5 Presentation (PDF) - Key Exchange: [here](https://github.com/billbuchanan/appliedcrypto/edit/main/unit05_key_exchange/lab)
+* Doodle lecture - Key Exchange: [here](https://www.youtube.com/watch?v=qmOA1d6lptY)
 <!-- * Week 5 Presentation (class lecture) - Key Exchange (Recorded 14 Feb 2020): [here](https://youtu.be/WIkDh_5198M) -->
 
 ## Lab