diff --git a/hosts/prefect/services/nsd/default.nix b/hosts/prefect/services/nsd/default.nix
index e2a6cdc..719048d 100644
--- a/hosts/prefect/services/nsd/default.nix
+++ b/hosts/prefect/services/nsd/default.nix
@@ -18,13 +18,17 @@ in {
         dnssec = false;
         data = dns.toString "thehedgehog.me" (import ./thehedgehog.me.nix {inherit dns;});
         provideXFR = [
+          # Afraid.org FreeDNS
           "69.65.50.192 NOKEY"
           "2001:1850:1:5:800::6b NOKEY"
+          # Hurricane Electric Free DNS
           "216.218.133.2 NOKEY"
           "2001:470:600::2 NOKEY"
         ];
         notify = [
+          # Afraid.org FreeDNS
           "69.65.50.192 NOKEY"
+          # Hurricane Electric Free DNS
           "216.218.130.2 NOKEY"
           "2001:470:100::2 NOKEY"
         ];
@@ -35,13 +39,17 @@ in {
         dnssec = false;
         data = dns.toString "yourmother.website" (import ./yourmother.website.nix {inherit dns;});
         provideXFR = [
+          # Afraid.org FreeDNS
           "69.65.50.192 NOKEY"
           "2001:1850:1:5:800::6b NOKEY"
+          # Hurricane Electric Free DNS
           "216.218.133.2 NOKEY"
           "2001:470:600::2 NOKEY"
         ];
         notify = [
+          # Afraid.org FreeDNS
           "69.65.50.192 NOKEY"
+          # Hurricane Electric Free DNS
           "216.218.130.2 NOKEY"
           "2001:470:100::2 NOKEY"
         ];
diff --git a/hosts/prefect/services/nsd/thehedgehog.me.nix b/hosts/prefect/services/nsd/thehedgehog.me.nix
index 65a1bd2..2c4655c 100644
--- a/hosts/prefect/services/nsd/thehedgehog.me.nix
+++ b/hosts/prefect/services/nsd/thehedgehog.me.nix
@@ -21,6 +21,7 @@
     "ns2.thehedgehog.me."
     "ns2.afraid.org."
     "ns1.he.net."
+    "slave.dns.he.net."
   ];
 
   TXT = [
diff --git a/hosts/prefect/services/nsd/yourmother.website.nix b/hosts/prefect/services/nsd/yourmother.website.nix
index ee711cd..e83d4d2 100644
--- a/hosts/prefect/services/nsd/yourmother.website.nix
+++ b/hosts/prefect/services/nsd/yourmother.website.nix
@@ -12,6 +12,7 @@
     "ns2.thehedgehog.me."
     "ns2.afraid.org."
     "ns1.he.net."
+    "slave.dns.he.net."
   ];
 
   A = [ "5.161.140.5" ];