diff --git a/unit05_key_exchange/lecture/README.MD b/unit05_key_exchange/lecture/README.MD
index d7383fa..e7277e5 100644
--- a/unit05_key_exchange/lecture/README.MD
+++ b/unit05_key_exchange/lecture/README.MD
@@ -12,8 +12,8 @@ What you should know at the end of unit?
 
 * Week 5 Presentation (lecture - Part 1) - Key Exchange: [here](https://youtu.be/l_osjo8r13Q)
 * Week 5 Presentation (lecture - Part 2) - Key Exchange: [here](https://youtu.be/95AuvZNm0Yg)
-* Week 5 Presentation (PDF) - Key Exchange: [here](https://asecuritysite.com/public/unit05_key_exchange.pdf)
-* Week 5 Presentation (class lecture) - Key Exchange (Recorded 14 Feb 2020): [here](https://youtu.be/WIkDh_5198M)
+* Week 5 Presentation (PDF) - Key Exchange: [here](https://asecuritysite.com/public/unit05_key_exchange.pdf)<!
+<!-- * Week 5 Presentation (class lecture) - Key Exchange (Recorded 14 Feb 2020): [here](https://youtu.be/WIkDh_5198M) -->
 
 ## Examples