diff --git a/2023-09-25.md b/2023-09-25.md
index 0284c82..eb99771 100644
--- a/2023-09-25.md
+++ b/2023-09-25.md
@@ -2,13 +2,12 @@
 
 ## TODO
 
-- [ ] Notes on possible architecture extensions to add support for a 16-bit IP
+- [x] Notes on possible architecture extensions to add support for a 16-bit IP
 - [ ] add tape drive to mainframe
 
 - review 8080 style io ports
     - works bc they have 2 operands per instruction, i think
 
-- [x] add notes on extended address space
 - [ ] add notes on re-arranging extended system docs