diff --git a/sys/man/8/plan9.ini b/sys/man/8/plan9.ini
index 29a4dd1f9..b7c2bd52b 100644
--- a/sys/man/8/plan9.ini
+++ b/sys/man/8/plan9.ini
@@ -493,7 +493,7 @@ to use as a root device for bootstrapping.
 .SS AUDIO
 .SS \fLaudio\fIX\fL=\fIvalue\fP
 This defines a sound interface. PCI based audio devices such as
-Intel HD audio or AC97 are autodetected and no not require any settings.
+Intel HD audio or AC97 are autodetected and do not require any settings.
 .PP
 Known types are
 .TF ess1688