diff --git a/_data/lectures_2023.yml b/_data/lectures_2023.yml
index f387923..1c251da 100644
--- a/_data/lectures_2023.yml
+++ b/_data/lectures_2023.yml
@@ -30,7 +30,7 @@
     <strong>Optimization</strong>
   topics:
   lectures: >
-    <a href="">Slides</a>, <a href="">Video</a>
+    <a href="https://piazza.com/class_profile/get_resource/lvmxcb90l234iq/m0ouw1zmwsw5aa">Slides</a>, <a href="">Video</a>
   readings:
   Homeworks: