diff --git a/unit01_cipher_fundamentals/lecture/README.md b/unit01_cipher_fundamentals/lecture/README.md
index 4cdac78..58f7571 100644
--- a/unit01_cipher_fundamentals/lecture/README.md
+++ b/unit01_cipher_fundamentals/lecture/README.md
@@ -17,7 +17,7 @@ The key concepts involved in this unit are:
 
 ## Presentations
 
-* Unit 2 Presentation (PDF) - Symmetric Key Encryption: [here](https://github.com/billbuchanan/appliedcrypto/blob/master/unit01_cipher_fundamentals/lecture/chapter01_ciphers_fundamentals.pdf)
-* Unit 2 Presentation (Video) - Symmetric Key Encryption [here](https://www.youtube.com/watch?v=zqmjUpJNcJA)
+* Unit 1 Presentation (PDF) - Symmetric Key Encryption: [here](https://github.com/billbuchanan/appliedcrypto/blob/master/unit01_cipher_fundamentals/lecture/chapter01_ciphers_fundamentals.pdf)
+* Unit 1 Presentation (Video) - Symmetric Key Encryption [here](https://www.youtube.com/watch?v=zqmjUpJNcJA)
 <!-- * Unit 2 Presentation (Lecture - Video) - Symmetric Key Encryption: [here](https://www.youtube.com/watch?v=3hkRjzl8B8w).  -->