diff --git a/usr.sbin/i4b/man/isic.4 b/usr.sbin/i4b/man/isic.4
index 8f9cbd643154..5536693c3dbe 100644
--- a/usr.sbin/i4b/man/isic.4
+++ b/usr.sbin/i4b/man/isic.4
@@ -32,7 +32,8 @@
 .Sh NAME
 .Nm isic
 .Nd isdn4bsd Siemens ISDN Chipset device driver
-.Sh FreeBSD SYNOPSIS (FreeBSD >= 4.0)
+.Sh SYNOPSIS
+.Ss FreeBSD (FreeBSD >= 4.0)
 .Pp
 Asuscom ISDNLink 128K (ISA PnP):
 .Cd options \&"ASUSCOM_IPAC\&"
@@ -91,7 +92,7 @@ Eicon.Diehl DIVA 2.0 and 2.02 ISA PnP card:
 .Cd options \&"EICON_DIVA\&"
 .Cd "device isic0"
 .Pp
-.Sh NetBSD SYNOPSIS
+.Ss NetBSD
 On the ISA bus:
 .Pp
 Teles S0/8 or Niccy 1008 card: