diff --git a/unit06_trust_dig_cert/README.md b/unit06_trust_dig_cert/README.md
index a313847..d3d7e2b 100644
--- a/unit06_trust_dig_cert/README.md
+++ b/unit06_trust_dig_cert/README.md
@@ -14,9 +14,10 @@ The key concepts are:
 
 ## Presentations
 
-* Unit 6 Presentation (PDF) - Digital Certs: [here](https://github.com/billbuchanan/appliedcrypto/blob/master/unit06_trust_dig_cert/lab/new_lab06.pdf).
-<!-- * Unit 6 Presentation (lecture) - Digital Certs: [here](https://youtu.be/2ptgq8u0I5g). -->
-* Unit 6 Presentation (video) - Digital Certs: [here](https://youtu.be/ZJ2G8KC1zDs).
+* Week 7 Presentation (PDF) - Digital Certs: [here](https://asecuritysite.com/public/chapter06_digital_cert.pdf).
+* Week 7 Presentation (video) - Digital Certs: [here](https://youtu.be/ZJ2G8KC1zDs).
+* Doodle: [here](https://youtu.be/k1sCVNg3mho)
+<!-- * Week 7 Presentation (lecture) - Digital Certs: [here](https://youtu.be/2ptgq8u0I5g). -->
 
 ## Lab