diff --git a/passt.1 b/passt.1
index 9c4da20..19e01d5 100644
--- a/passt.1
+++ b/passt.1
@@ -310,7 +310,7 @@ By default, IPv6 operation is enabled as long as at least an IPv6 default route
 and an interface address are configured on a given host interface.
 
 .TP
-.BR \-4 ", " \-\-ipv6-only
+.BR \-6 ", " \-\-ipv6-only
 Enable IPv6-only operation. IPv4 traffic will be ignored.
 By default, IPv4 operation is enabled as long as at least an IPv4 default route
 and an interface address are configured on a given host interface.