diff --git a/deno.json b/deno.json
index d6ed9b1..79d8ccf 100644
--- a/deno.json
+++ b/deno.json
@@ -1,6 +1,6 @@
 {
   "name": "@hckhanh/vn-number",
-  "version": "1.1.1",
+  "version": "1.1.2",
   "exports": "./src/index.ts",
   "exclude": [
     ".github/",
diff --git a/src/read/index.test.ts b/src/read/index.test.ts
index 4150560..783338b 100644
--- a/src/read/index.test.ts
+++ b/src/read/index.test.ts
@@ -9,4 +9,8 @@ describe('index', function () {
   it('should read number 2.000.000.000 in number', function () {
     expect(readVnNumber(2000000000)).to.equal('hai tỷ')
   })
+
+  it('should read number 2.500.000.000 in BigIn', function () {
+    expect(readVnNumber(BigInt(2500000000))).to.equal('hai tỷ năm trăm triệu')
+  })
 })
diff --git a/src/read/index.ts b/src/read/index.ts
index b244d69..f1f4a13 100644
--- a/src/read/index.ts
+++ b/src/read/index.ts
@@ -11,12 +11,13 @@ import NumberReader from './NumberReader.ts'
  * ```ts
  * import { readVnNumber } from '@hckhanh/vn-number'
  *
- * readVnNumber('19990000') // or readVnNumber(19990000) // output: mười chín triệu chín trăm chín mươi nghìn
+ * readVnNumber('19990000') // or readVnNumber(19990000)
+ * // output: mười chín triệu chín trăm chín mươi nghìn
  * ```
  *
  * @param number the number to read. It can be string or number type
  * @return the Vietnamese number in string.
  */
-export function readVnNumber(number: string | number): string {
+export function readVnNumber(number: string | number | BigInt): string {
   return NumberReader.read(number)
 }