diff --git a/Assembly-program-examples.md b/Assembly-program-examples.md
index 4a0d19c..08adf07 100644
--- a/Assembly-program-examples.md
+++ b/Assembly-program-examples.md
@@ -81,7 +81,7 @@ y_is_positive:
 
 ```
 
-Constants by hackersoup
+Constants by hackersoup with [more contributors](https://github.com/simon987/Much-Assembly-Required/wiki/Assembly-program-examples/_history)
 ```assembly
 ;; Hardware IDs
 HWID_LEGS     equ 0x1
@@ -129,6 +129,9 @@ LASER_WITHDRAW equ 1 ; Cost: 30kJ
 LASER_DEPOSIT  equ 2 ; Cost: 30kJ
   ;; Withdraw the desired item
 
+;; items that can be used with the Laser
+ITEM_BIOMASS   equ 0x1
+
 ;; Additional Info
 ;; Specify the desired item by setting the value of the B register with an item ID.
 
@@ -172,7 +175,16 @@ KEYBOARD_CLEAR     equ 0 ; Cost: 0kJ
 KEYBOARD_FETCH_KEY equ 1 ; Cost: 0kJ
   ;; Reads the oldest keycode from the buffer into the B register and remove it
 
+;; keys to use with Keyboard Hardware
+KEY_A   equ 0x41
+KEY_D   equ 0x44
+KEY_E   equ 0x45
+KEY_F   equ 0x46
+KEY_S   equ 0x53
+KEY_W   equ 0x57
+
 ;;  Additional Info
+;;  The keycodes in game are in hexidecimal but in the url below they're in decimal
 ;;  Keycodes: keycode.info