diff --git a/README b/README
index 76b1500..68ef2b2 100644
--- a/README
+++ b/README
@@ -475,6 +475,18 @@
 		define this to a list of base addresses for each (supported)
 		port. See e.g. include/configs/versatile.h
 
+		CONFIG_PL011_SERIAL_RLCR
+
+		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
+		have separate receive and transmit line control registers.  Set
+		this variable to initialize the extra register.
+
+		CONFIG_PL011_SERIAL_FLUSH_ON_INIT
+
+		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
+		boot loader that has already initialized the UART.  Define this
+		variable to flush the UART at init time.
+
 
 - Console Interface:
 		Depending on board, define exactly one serial port