diff --git a/src/lib/bolt11.test.ts b/src/lib/bolt11.test.ts
index ca303b1..efe762d 100644
--- a/src/lib/bolt11.test.ts
+++ b/src/lib/bolt11.test.ts
@@ -26,9 +26,9 @@ describe('getSatoshisFromBolt11', () => {
     expect(getSatoshisFromBolt11('lnbc1pvjluezpp5abcdef')).toBe(0);
   });
 
-  it('handles a 21-sat zap (2100n)', () => {
-    // 2100n → 2100 * 1e-9 BTC = 21 sats
-    expect(getSatoshisFromBolt11('lnbc2100n1pvjluezpp5abcdef')).toBe(21);
+  it('handles a 21-sat zap (210n)', () => {
+    // 210n → 210 * 1e-9 BTC = 2.1e-7 BTC = 21 sats
+    expect(getSatoshisFromBolt11('lnbc210n1pvjluezpp5abcdef')).toBe(21);
   });
 
   it('is case-insensitive (uppercase invoice)', () => {
diff --git a/src/lib/verifyInvoice.test.ts b/src/lib/verifyInvoice.test.ts
index 2e3c8c3..09fa8a4 100644
--- a/src/lib/verifyInvoice.test.ts
+++ b/src/lib/verifyInvoice.test.ts
@@ -3,13 +3,13 @@ import { assertInvoiceAmount } from './verifyInvoice';
 
 describe('assertInvoiceAmount', () => {
   it('accepts an invoice whose amount matches the expected sats', () => {
-    // lnbc2100n… = 21 sats
-    expect(() => assertInvoiceAmount('lnbc2100n1pvjluez', 21)).not.toThrow();
+    // lnbc210n… = 210 * 1e-9 BTC = 21 sats
+    expect(() => assertInvoiceAmount('lnbc210n1pvjluez', 21)).not.toThrow();
   });
 
   it('accepts a 1-sat rounding difference (millisat↔sat slack)', () => {
-    // lnbc2100n… = 21 sats, expected 22 → diff of 1 is allowed
-    expect(() => assertInvoiceAmount('lnbc2100n1pvjluez', 22)).not.toThrow();
+    // lnbc210n… = 21 sats, expected 22 → diff of 1 is allowed
+    expect(() => assertInvoiceAmount('lnbc210n1pvjluez', 22)).not.toThrow();
   });
 
   it('rejects an over-charging invoice (the core attack it defends against)', () => {