diff --git a/README b/README
index 26d5ad2..af37d41 100644
--- a/README
+++ b/README
@@ -3766,10 +3766,11 @@
 		You only need to set this if address zero isn't writeable
 
 - CONFIG_SYS_MEM_RESERVE_SECURE
+		Only implemented for ARMv8 for now.
 		If defined, the size of CONFIG_SYS_MEM_RESERVE_SECURE memory
 		is substracted from total RAM and won't be reported to OS.
 		This memory can be used as secure memory. A variable
-		gd->secure_ram is used to track the location. In systems
+		gd->arch.secure_ram is used to track the location. In systems
 		the RAM base is not zero, or RAM is divided into banks,
 		this variable needs to be recalcuated to get the address.