diff --git a/avr/devices/c03/defs.asm b/avr/devices/c03/defs.asm
index e45f6a9..a7e484b 100644
--- a/avr/devices/c03/defs.asm
+++ b/avr/devices/c03/defs.asm
@@ -38,9 +38,9 @@
 
 
 
-.equ BOOTLOADER_ADDR = 0x7c00
+.equ BOOTLOADER_ADDR = 0x7c00 ; word address (=0xf800 in byte address)
 
-.equ RESSOURCE_ADDR  = 0x4000
+.equ RESSOURCE_ADDR  = 0x4000 ; word address (=0x8000 in byte address)
 
 .equ FIRMWARE_VARIANT_BOOT        = 0
 .equ FIRMWARE_VARIANT_TEMP_WINDOW = 1