diff --git a/doc/README.serial_multi b/doc/README.serial_multi
index 1d73376..a8d48fc 100644
--- a/doc/README.serial_multi
+++ b/doc/README.serial_multi
@@ -2,6 +2,8 @@
 intended to allow for modem dial-in / dial-out while still being able
 to use a serial console on a (different) serial port.
 
+MPC8XX Specific
+===============
 At the moment, the ports must be split on a SMC and a SCC port  on  a
 8xx processor; other configurations are not (yet) supported.
 
@@ -35,3 +37,18 @@
 After that press 'enter' at the SCC console. Note that baudrates <38400
 are not allowed on LWMON with watchdog enabled (see CFG_BAUDRATE_TABLE in
 include/configs/lwmon.h).
+
+
+PPC4XX Specific
+===============
+*) The default console is UART0
+
+*) The console can be switched to UART1 by any of the following commands:
+	setenv stdout serial1
+	setenv stderr serial1
+	setenv stdin serial1
+
+*) The console can be switched to UART0 by any of the following commands:
+	setenv stdout serial0
+	setenv stderr serial0
+	setenv stdin serial0