diff --git a/arch/arc/include/asm/cache.h b/arch/arc/include/asm/cache.h
index b3c750979aa1c84051e6b2a684bdb0accc043c6c..7861255da32d64aa62e03d6fa881f84d9abf3b2f 100644
--- a/arch/arc/include/asm/cache.h
+++ b/arch/arc/include/asm/cache.h
@@ -20,7 +20,7 @@
 #define CACHE_LINE_MASK		(~(L1_CACHE_BYTES - 1))
 
 /*
- * ARC700 doesn't cache any access in top 256M.
+ * ARC700 doesn't cache any access in top 1G (0xc000_0000 to 0xFFFF_FFFF)
  * Ideal for wiring memory mapped peripherals as we don't need to do
  * explicit uncached accesses (LD.di/ST.di) hence more portable drivers
  */