diff --git a/hardware.inc b/hardware.inc
index c14af1d..e87f78a 100644
--- a/hardware.inc
+++ b/hardware.inc
@@ -1083,6 +1083,14 @@ def INT_HANDLER_SERIAL equ $0058 ; serial interrupt handler address
 def INT_HANDLER_JOYPAD equ $0060 ; joypad interrupt handler address
 
 
+;******************************************************************************
+; ROM header address
+;******************************************************************************
+
+def ROM_HEADER equ $0100 ; $0100-$014F
+def ROM_HEADER_SIZE equ $50
+
+
 ;******************************************************************************
 ; Boot-up register values
 ;******************************************************************************