-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"