diff --git a/content/notes/10-routes-controllers.md b/content/notes/10-routes-controllers.md
index 86f854e25..ae68daf6d 100644
--- a/content/notes/10-routes-controllers.md
+++ b/content/notes/10-routes-controllers.md
@@ -4,6 +4,9 @@ aliases:
 tags: 
 - cosc203
 - lecture
+sr-due: 2022-09-24
+sr-interval: 3
+sr-ease: 250
 ---
 
 [slides](https://blackboard.otago.ac.nz/bbcswebdav/pid-2971203-dt-content-rid-19033355_1/courses/COSC203_S2DNI_2022/COSC203_lecture10%281%29.pdf)
diff --git a/content/notes/13-OS-intro.md b/content/notes/13-OS-intro.md
new file mode 100644
index 000000000..395090026
--- /dev/null
+++ b/content/notes/13-OS-intro.md
@@ -0,0 +1,22 @@
+---
+title: "13-OS-intro"
+aliases: 
+tags: 
+- cosc204
+- lecture
+---
+
+
+# why learn OS
+- security
+- optimisation
+- wierd bugs
+- "crown of programming"
+- understand hardware better
+- embedded sys and IoT
+- co-design of hardware and software
+
+# what is an OS
+![big picture diagram|400](https://i.imgur.com/9O1YR0p.png)
+-  a program (also called OS kernel) loaded onto RAM first when pc is turned on
+- OS kernel (in kernel space)
\ No newline at end of file
diff --git a/content/notes/cosc-203.md b/content/notes/cosc-203.md
index 63a15f389..d15d9a048 100644
--- a/content/notes/cosc-203.md
+++ b/content/notes/cosc-203.md
@@ -33,7 +33,7 @@ tags:
 - [07-js-server-vs-client-side](notes/07-js-server-vs-client-side.md)
 - [08-web-frameworks](notes/08-web-frameworks.md)
 - [09-web-databases-networks](notes/09-web-databases-networks.md)
-- 
+- [10-routes-controllers](notes/10-routes-controllers.md)
 
 # Archive