doc: a little bit of documentation

applications/dns.nix

@@ -43,6 +43,20 @@ in {
           "193.1.100.131"
         ];
 
+        /*
+        put any other zones above skynet and link to their files like so:
+
+          skynet.ie = {
+            extraConfig = "";
+            file = ./dns/skynet;
+            master = true;
+            masters = [];
+            slaves = [ ];
+          };
+
+        Skynet is handled a bit more dynamically since it is the key one we should focus on
+        */
+
         skynet.ie = {
             extraConfig = "";
             file = ./dns/skynet;