diff --git a/_modules/week-15.md b/_modules/week-15.md
index cc9d308..b1c433e 100644
--- a/_modules/week-15.md
+++ b/_modules/week-15.md
@@ -7,7 +7,7 @@ Dec 3
 : **Lecture 27**{: .label .label-lecture} [Neural Networks](lecture/lec27)
 : **Lecture Participation 27**{: .label .label-survey} [Lecture Participation 27](https://app.sli.do/event/9dMziZggWndzkyknL1qZ3V/embed/polls/2f53defb-aa54-4671-9e71-b328de410af7){:target="_blank"}
 : **Discussion 13**{: .label .label-disc } [PCA + Clustering](https://drive.google.com/file/d/1nrPVzLPzcHhyE4eDko0B_eSh-8BeQOGr/view?usp=sharing){:target="_blank"}
-    : [Mini-Lecture](https://youtu.be/kZzhgzMFnDU){:target="_blank"}, [Solutions](https://drive.google.com/file/d/1Wz75d38YQqC16Q6yUtDL5gEU2cQNtj65/view?usp=sharing){:target="_blank"}
+    : [Mini-Lecture](https://youtu.be/kZzhgzMFnDU){:target="_blank"}, [Solutions](https://drive.google.com/file/d/1Wz75d38YQqC16Q6yUtDL5gEU2cQNtj65/view?usp=sharing), [Walkthrough](https://youtu.be/Rad6iYKL0nc){:target="_blank"}
 
 Dec 5
 : **Lecture 28**{: .label .label-lecture} [LLMs + closing](lecture/lec28)