diff --git a/_toc.yml b/_toc.yml
index 78d6ce8..fd520a6 100755
--- a/_toc.yml
+++ b/_toc.yml
@@ -146,7 +146,7 @@ parts:
     sections:
       - file: notes/week13/videos
       - file: notes/week13/class13A
-      # - file: notes/week13/class13B
+      - file: notes/week13/class13B
 
 # - caption: Week 13 - Exam Review
 #   chapters:
diff --git a/notes/week13/class13B.md b/notes/week13/class13B.md
index 1d5ae80..22bc6e0 100644
--- a/notes/week13/class13B.md
+++ b/notes/week13/class13B.md
@@ -3,7 +3,7 @@
 Today we will be working on the Travelling Salesperson problem (the slides are the same as 13A).
 
 <div>
-<iframe src="../../Lec18_Maps.pdf" width="100%" height="600px" frameBorder="0"> </iframe>
+<iframe src="../../Lec19_Maps2.pdf" width="100%" height="600px" frameBorder="0"> </iframe>
 </div>
 
 [Download the Slides from today](https://github.com/ubc-cs/cpsc203/raw/main/files/Lec19_Maps2.pdf)