diff --git a/_modules/week-13.md b/_modules/week-13.md
index 99bd83f..7af8287 100644
--- a/_modules/week-13.md
+++ b/_modules/week-13.md
@@ -5,6 +5,7 @@ title: Week 13
 
 Nov 19
 : **Lecture 24**{: .label .label-lecture} [PCA I](lecture/lec24)
+    : [Note 24](https://ds100.org/course-notes/pca_1/pca_1.html)
 : **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"}