diff --git a/sys/man/8/plan9.ini b/sys/man/8/plan9.ini
index e91abb517..fcedc8558 100644
--- a/sys/man/8/plan9.ini
+++ b/sys/man/8/plan9.ini
@@ -833,4 +833,7 @@ Also, the delay before any messages appear at boot time
 is disconcerting, as any error messages from the BIOS
 are lost.
 .PP
-This idea is at best an interesting experiment that needs another iteration.
+The declaration of a kernel parameter wich is a prefix of
+previously declared parameters will delete the previous
+ones. If this is not desired, parameters should be given
+in shortest to longest order.