diff --git a/app/Demo/DemoSeeder.php b/app/Demo/DemoSeeder.php
new file mode 100644
index 0000000..b6e0d48
--- /dev/null
+++ b/app/Demo/DemoSeeder.php
@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Modules\EInvoicing\Demo;
+
+use Illuminate\Database\Seeder;
+use Modules\EInvoicing\Application\EInvoicingSettings;
+
+/**
+ * E-invoicing switched on for the public demo, with the bank details and
+ * payment terms an e-invoice asks for, so the demo's invoices show the
+ * module at work as soon as it opens.
+ *
+ * The host's demo reset calls run() once the demo company exists, passing
+ * the company to fill. A company that already has an IBAN is left alone.
+ */
+final class DemoSeeder extends Seeder
+{
+    /** The IBAN and BIC used as examples everywhere, not a real account. */
+    public const IBAN = 'DE89370400440532013000';
+
+    public const BIC = 'COBADEFFXXX';
+
+    public const PAYMENT_TERMS = 'Payable within 14 days without deduction.';
+
+    public function run(int $companyId, EInvoicingSettings $settings): void
+    {
+        if ($settings->iban($companyId) !== null) {
+            return;
+        }
+
+        $settings->save($companyId, [
+            'enabled' => true,
+            'iban' => self::IBAN,
+            'bic' => self::BIC,
+            'payment_terms' => self::PAYMENT_TERMS,
+        ]);
+    }
+}
diff --git a/module.json b/module.json
index f9baf7b..8fc2084 100644
--- a/module.json
+++ b/module.json
@@ -17,7 +17,7 @@
     "requires": {},
     "schema_version": 2,
     "slug": "e-invoicing",
-    "version": "0.1.0",
+    "version": "0.1.1",
     "license": "AGPL-3.0-only",
     "compatibility": {
         "invoiceshelf": ">=3.0.0-alpha.13 <4.0.0",
diff --git a/tests/Unit/DemoSeederTest.php b/tests/Unit/DemoSeederTest.php
new file mode 100644
index 0000000..808ccff
--- /dev/null
+++ b/tests/Unit/DemoSeederTest.php
@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Modules\EInvoicing\Tests\Unit;
+
+use Modules\EInvoicing\Application\EInvoicingSettings;
+use Modules\EInvoicing\Demo\DemoSeeder;
+use Modules\EInvoicing\Tests\TestCase;
+
+final class DemoSeederTest extends TestCase
+{
+    public function test_the_demo_reset_switches_e_invoicing_on_with_bank_details_and_terms(): void
+    {
+        // The call the host's DemoReset makes for each pinned module.
+        app(DemoSeeder::class)->setContainer(app())->__invoke(['companyId' => self::COMPANY]);
+
+        self::assertSame([
+            'enabled' => true,
+            'iban' => DemoSeeder::IBAN,
+            'bic' => DemoSeeder::BIC,
+            'payment_terms' => DemoSeeder::PAYMENT_TERMS,
+        ], app(EInvoicingSettings::class)->forCompany(self::COMPANY));
+    }
+
+    public function test_a_company_that_already_has_an_iban_is_left_alone(): void
+    {
+        $settings = app(EInvoicingSettings::class);
+        $settings->save(self::COMPANY, ['enabled' => false, 'iban' => self::IBAN]);
+
+        app(DemoSeeder::class)->setContainer(app())->__invoke(['companyId' => self::COMPANY]);
+
+        self::assertSame(['enabled' => false, 'iban' => self::IBAN, 'bic' => null, 'payment_terms' => null], $settings->forCompany(self::COMPANY));
+    }
+}