diff --git a/_modules/week-12.md b/_modules/week-12.md
index e8bb1ec..868c5c2 100644
--- a/_modules/week-12.md
+++ b/_modules/week-12.md
@@ -15,7 +15,7 @@ Nov 14
     : [Note 23](https://ds100.org/course-notes/logistic_regression_2/logistic_reg_2.html)
 : **Lecture Participation 23**{: .label .label-survey} [Lecture Participation 23](https://app.sli.do/event/4ZSN95RjYcTrxRLMx852ah/embed/polls/94bb1b61-6135-4ade-9d14-a325c62d8f8f){:target="_blank"}
 : **Exam Prep 10**{: .label .label-examprep } [Logistic Regression](https://drive.google.com/file/d/1-Sao8s4VblNk6U4qH5y1GiDyw8OlADRs/view?usp=sharing){:target="_blank"}
-    : [Solutions](https://drive.google.com/file/d/1WJI0Uh55l03UNgGFCG1oo59IGELuEBp_/view?usp=sharing){:target="_blank"}
+    : [Solutions](https://drive.google.com/file/d/1WJI0Uh55l03UNgGFCG1oo59IGELuEBp_/view?usp=sharing), [Walkthrough](https://youtu.be/VOOCYnHLaX4){:target="_blank"}
 
 Nov 15
 : **Lab 11**{: .label .label-lab }  [Logistic Regression](https://data100.datahub.berkeley.edu/hub/user-redirect/git-pull?repo=https%3A%2F%2Fgithub.com%2FDS-100%2Ffa24-student&urlpath=lab%2Ftree%2Ffa24-student%2Flab%2Flab11%2Flab11.ipynb&branch=main) (due Nov 19)
diff --git a/_modules/week-13.md b/_modules/week-13.md
index 949f7d0..b9e2dd0 100644
--- a/_modules/week-13.md
+++ b/_modules/week-13.md
@@ -16,7 +16,7 @@ Nov 21
     : [Note 25](https://ds100.org/course-notes/pca_2/pca_2.html)
 : **Lecture Participation 25**{: .label .label-survey} [Lecture Participation 25](https://app.sli.do/event/dg6qh3GWTi2hUqMQ38Vh7Q/embed/polls/aa132422-6dff-4e7f-a998-51539117a566){:target="_blank"}
 : **Exam Prep 11**{: .label .label-examprep } [PCA and Clustering](https://drive.google.com/file/d/1b_9xqm8FV-GqAysPb91WStmlO4tRA7UL/view?usp=sharing){:target="_blank"}
-    : [Solutions](https://drive.google.com/file/d/1CxOYYCuGNQNGBjF7_W-sYQWLCYQerwA-/view?usp=sharing){:target="_blank"}
+    : [Solutions](https://drive.google.com/file/d/1CxOYYCuGNQNGBjF7_W-sYQWLCYQerwA-/view?usp=sharing), [Walkthrough](https://youtu.be/AMuXOwcv92E){:target="_blank"}
 
 Nov 22
 : **Lab 12**{: .label .label-lab }  [PCA](https://data100.datahub.berkeley.edu/hub/user-redirect/git-pull?repo=https%3A%2F%2Fgithub.com%2FDS-100%2Ffa24-student&urlpath=lab%2Ftree%2Ffa24-student%2Flab%2Flab12%2Flab12.ipynb&branch=main) (due Nov 26)