diff --git a/notes/todo.md b/notes/todo.md
index a2b9df8..76eeb54 100644
--- a/notes/todo.md
+++ b/notes/todo.md
@@ -4,6 +4,7 @@
 
 ## Research
 
+- [ ] Learn how the C64's PC gets initialized (what is the initial value? how is it set?)
 - [ ] Review CHIP-8
     - read about the spec / ISA
     - read these, and add them to the bibliography: