diff --git a/sys/arm/conf/ATMEL b/sys/arm/conf/ATMEL
index 4eafcc2a719..fc2316508d6 100644
--- a/sys/arm/conf/ATMEL
+++ b/sys/arm/conf/ATMEL
@@ -8,7 +8,8 @@ ident		ATMEL
 
 include "../at91/std.atmel"
 
-# Arbitrary values for testing purposes.
+# Typical values for most SoCs and board configurations.  Will not work for
+# at91sam9g45 or on some boards with non u-boot boot loaders.
 options 	STARTUP_PAGETABLE_ADDR=0x20800000
 makeoptions	KERNPHYSADDR=0x20000000
 makeoptions	KERNVIRTADDR=0xc0000000