diff --git a/aa174a_aut2425/index.html b/aa174a_aut2425/index.html
index 4d54bbf..87b3ab1 100644
--- a/aa174a_aut2425/index.html
+++ b/aa174a_aut2425/index.html
@@ -228,8 +228,8 @@ <h3>Schedule</h3>
               </td>
               <td class="tg-vnl4">
                 <!-- Week 4 Lecture Slides -->
-                <!-- <a href="pdfs/lecture/lecture_7.pdf">Lecture 7</a>
-                <br/><a href="pdfs/lecture/lecture_8.pdf">Lecture 8</a> -->
+                <a href="pdfs/lecture/lecture_7.pdf">Lecture 7</a>
+                <!-- <br/><a href="pdfs/lecture/lecture_8.pdf">Lecture 8</a> -->
               </td>
               <td class="tg-vnl4">
                 <!-- Week 4 Notebook -->
@@ -237,7 +237,7 @@ <h3>Schedule</h3>
               </td>
               <td class="tg-vnl4">
                 <!-- Week 4 Sections -->
-                <!-- <a href="https://alvinsun.notion.site/Section-4-Controller-Gain-Tuning-in-Hardware-93463b095b0445fc9a81ee3f5930b82c?pvs=4"> -->
+                <a href="https://ishikaa.notion.site/Section-4-Controller-Gain-Tuning-in-Hardware-10e16ad787058183b104c98822449eb8?pvs=4">
                   <!-- Section 4 Handout -->
                 </a>
               </td>
diff --git a/aa174a_aut2425/pdfs/lecture/lecture_7.pdf b/aa174a_aut2425/pdfs/lecture/lecture_7.pdf
index 1a42ce8..146b837 100644
Binary files a/aa174a_aut2425/pdfs/lecture/lecture_7.pdf and b/aa174a_aut2425/pdfs/lecture/lecture_7.pdf differ