diff --git a/sys/man/8/plan9.ini b/sys/man/8/plan9.ini
index 314590ca5..aee916b04 100644
--- a/sys/man/8/plan9.ini
+++ b/sys/man/8/plan9.ini
@@ -453,7 +453,7 @@ The defaults are
 .EX
 port=0x220 irq=7 dma=5
 .EE
-.SS Uarts
+.SS UARTS
 Plan 9 automatically configures COM1 and COM2, if found,
 as
 .B eia0
@@ -470,15 +470,17 @@ eia\fIX\fP=disabled
 .LP
 This is typically done in order to reuse the IRQ for
 another device.
+.P 
+.PP
+Additional i8250 (ISA) uarts (uart2 to uart6) can be
+configured using:
+.IP
+.EX
+uart\fIX\fP=type=isa port=\fIport\fP irq=\fIirq
+.EE
 .PP
-Plan 9 used to support various serial concentrators,
-including the TTC 8 serial line card and various models
-in the Star Gate Avanstar series of intelligent serial boards.
-These are no longer supported; the much simpler
 Perle PCI-Fast4, PCI-Fast8, and PCI-Fast16 controllers
-have taken their places.
-These latter cards are automatically detected
-and need no configuration lines.
+are automatically detected and need no configuration lines.
 .PP
 The line
 .B serial=type=com