diff --git a/modules/paperless/default.nix b/modules/paperless/default.nix
index 0a924cd5..ed9696d8 100644
--- a/modules/paperless/default.nix
+++ b/modules/paperless/default.nix
@@ -56,6 +56,8 @@ in {
         Here, the scannerDevice is `hp3900:libusb:005:002`.
       '';
       type = types.str;
+      example = "hp3900:libusb:005:002";
+      default = "";
     };
   };