diff --git a/man/tio.1.in b/man/tio.1.in
index d6a5f9f..304f3c3 100644
--- a/man/tio.1.in
+++ b/man/tio.1.in
@@ -6,7 +6,7 @@ tio \- a simple serial device I/O tool
 .SH "SYNOPSIS"
 .PP
 .B tio
-.RI "[" <options> "] " "<tty-device|config>"
+.RI "[" <options> "] " "<tty-device|sub-config>"
 
 .SH "DESCRIPTION"
 .PP