typo

howto/dns.md

@@ -27,7 +27,7 @@ their resolvers.
 
 Zone records can be added or modified to a zone in the `domains` git
 and a push. DNSSEC records are managed automatically by
-`manage-dnssec-keys` in the `dns/dns-helpers` git repository. through
+`manage-dnssec-keys` in the `dns/dns-helpers` git repository, through
 a cron job in the `dnsadm` user on the master DNS server (currently
 nevii).