diff --git a/README b/README
index 5d472ecc85b1d0b9ab98c4418b3523b955760b41..b89768f17917f9bfcf79ad9c462346f6835db639 100644
--- a/README
+++ b/README
@@ -1240,9 +1240,6 @@ typically in board_init_f() and board_init_r().
 Configuration Settings:
 -----------------------
 
-- MEM_SUPPORT_64BIT_DATA: Defined automatically if compiled as 64-bit.
-		Optionally it can be defined to support 64-bit memory commands.
-
 - CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
 		undefine this when you're short of memory.