diff --git a/nixos/modules/services/networking/bind.nix b/nixos/modules/services/networking/bind.nix
index 57547da10067..34e7470dfc6f 100644
--- a/nixos/modules/services/networking/bind.nix
+++ b/nixos/modules/services/networking/bind.nix
@@ -24,6 +24,8 @@ let
         pid-file "/var/run/named/named.pid";
       };
 
+      ${cfg.extraConfig}
+
       ${ concatMapStrings
           ({ name, file, master ? true, slaves ? [], masters ? [] }:
             ''
@@ -110,6 +112,13 @@ in
         }];
       };
 
+      extraConfig = mkOption {
+        default = "";
+        description = "
+          Extra lines to be added verbatim to the generated named configuration file.
+        ";
+      };
+
       configFile = mkOption {
         default = confFile;
         description = "