specified, but loaded when extra options are specified, too.
-This extension is loaded if `--protocol ipv6-icmp' or `--protocol icmpv6' is
+This extension can be used if `--protocol ipv6-icmp' or `--protocol icmpv6' is
specified. It provides the following option:
.TP
.BR "--icmpv6-type " "[!] \fItype\fP[/\fIcode\fP]|\fItypename\fP"
-These extensions are loaded if `--protocol tcp' is specified. It
+These extensions can be used if `--protocol tcp' is specified. It
provides the following options:
.TP
.BR "--source-port " "[!] \fIport\fP[:\fIport\fP]"
-These extensions are loaded if `--protocol udp' is specified. It
+These extensions can be used if `--protocol udp' is specified. It
provides the following options:
.TP
.BR "--source-port " "[!] \fIport\fP[:\fIport\fP]"
-This extension is loaded if `--protocol icmp' is specified. It
+This extension can be used if `--protocol icmp' is specified. It
provides the following option:
.TP
.BR "--icmp-type " "[!] \fItypename\fP"
-These extensions are loaded if `--protocol tcp' is specified. It
+These extensions can be used if `--protocol tcp' is specified. It
provides the following options:
.TP
.BR "--source-port " "[!] \fIport\fP[:\fIport\fP]"
-These extensions are loaded if `--protocol udp' is specified. It
+These extensions can be used if `--protocol udp' is specified. It
provides the following options:
.TP
.BR "--source-port " "[!] \fIport\fP[:\fIport\fP]"