1 files changed, 7 insertions, 2 deletions
diff --git a/modules/device/default.nix b/modules/device/default.nix
index a1f80ef..23be585 100644
--- a/modules/device/default.nix
+++ b/modules/device/default.nix
@@ -4,10 +4,10 @@ let
   devices = import ../../data/devices.nix;
 
   hardware = mkOption {
-    type = types.strMatching ''^kobo\d+$'';
+    type = types.strMatching ''^kobo[0-9]+$'';
   };
   deviceID = mkOption {
-    type = types.strMatching ''00000000-0000-0000-0000-000000000\d\d\d'';
+    type = types.strMatching ''^00000000-0000-0000-0000-000000000[0-9][0-9][0-9]$'';
   };
 
   deviceInfo = types.submodule {
@@ -41,6 +41,11 @@ in {
       deviceID = deviceID // {
         default = config._allDevices.${config.device.name}.deviceID;
       };
+
+      serialNumber = mkOption {
+        type = types.str;
+        default = "N0";
+      };
     };
   };
 }