diff --git a/_modules/week-02.md b/_modules/week-02.md
index e0ab574..c5410cb 100644
--- a/_modules/week-02.md
+++ b/_modules/week-02.md
@@ -5,8 +5,8 @@ status: Active
 ---
 
 Jan 17
-: **1**{: .label} Basics: Process
-  : [Slides](assets/slides/4_os.pdf) • [Recording](#)
+: **1**{: .label} Basics: OS-1
+  : [Slides](assets/slides/4_os-1.pdf) • [Recording](https://podcast.ucsd.edu/watch/wi24/dsc204a_a00/4)
 : *Reading:* 
 * [OSTEP Chapter 4 (required)](https://pages.cs.wisc.edu/~remzi/OSTEP/cpu-intro.pdf)
 * [OSTEP Chapter 6 (optional)](https://pages.cs.wisc.edu/~remzi/OSTEP/cpu-mechanisms.pdf)
@@ -14,8 +14,8 @@ Jan 17
 
 
 Jan 19
-: **2**{: .label} Basics: Memory
-  : [Slides](#) • [Recording](#)
+: **2**{: .label} Basics: OS-2
+  : [Slides](assets/slides/5_os-2.pdf) • [Recording](https://podcast.ucsd.edu/watch/wi24/dsc204a_a00/5)
 : *Reading:* 
 * [OSTEP Chapter 18 (required)](https://pages.cs.wisc.edu/~remzi/OSTEP/vm-paging.pdf)
 * [OSTEP Chapter 15 (optional)](https://pages.cs.wisc.edu/~remzi/OSTEP/vm-mechanism.pdf)
diff --git a/assets/slides/4_os.pdf b/assets/slides/4_os-1.pdf
similarity index 64%
rename from assets/slides/4_os.pdf
rename to assets/slides/4_os-1.pdf
index ebbbf50..28574a7 100644
Binary files a/assets/slides/4_os.pdf and b/assets/slides/4_os-1.pdf differ
diff --git a/assets/slides/5_os-2.pdf b/assets/slides/5_os-2.pdf
new file mode 100644
index 0000000..21a84b3
Binary files /dev/null and b/assets/slides/5_os-2.pdf differ