diff --git a/todo.md b/todo.md
index 0d28487..84c4e73 100644
--- a/todo.md
+++ b/todo.md
@@ -62,3 +62,6 @@
     * [ ] https://www.inmotionhosting.com/support/product-guides/cloud-server/ssh-security-sftp-ubuntu-cloud-server/
 
 * [ ] real-time operating systems
+    * [ ] todo lists
+        * [ ] meta af
+        * [ ] nesting them like this is super cool