diff --git a/_modules/week-13.md b/_modules/week-13.md
index e8cbffa..4e75924 100644
--- a/_modules/week-13.md
+++ b/_modules/week-13.md
@@ -9,7 +9,7 @@ Nov 19
 : **Lecture Participation 24**{: .label .label-survey} [Lecture Participation 24](https://app.sli.do/event/2FZdxc3hwkP2oKfNc8No9w/embed/polls/919c4524-31f2-441c-97fa-86b132d9145b){:target="_blank"}
 
 : **Discussion 12**{: .label .label-disc } [Logistic Regression](https://drive.google.com/file/d/17fX-MKA0WyYBYsXUFQR6jnXyKbKSUSd1/view?usp=sharing){:target="_blank"}
-    : [Mini-Lecture](https://youtu.be/fseH10rEg3w){:target="_blank"}, [Solutions](https://drive.google.com/file/d/1bwsYqyumVCJYbBpHPq5zKwdtrMoYbzTa/view?usp=sharing){:target="_blank"}
+    : [Mini-Lecture](https://youtu.be/fseH10rEg3w){:target="_blank"}, [Solutions](https://drive.google.com/file/d/1bwsYqyumVCJYbBpHPq5zKwdtrMoYbzTa/view?usp=sharing),[Walkthrough](https://www.youtube.com/watch?v=mbm4lw62C3k){:target="_blank"}
 
 Nov 21
 : **Lecture 25**{: .label .label-lecture} [PCA II](lecture/lec25)