diff --git a/readme.md b/readme.md
index 848a172..5bfdd72 100644
--- a/readme.md
+++ b/readme.md
@@ -70,6 +70,7 @@ All the below methods accept a value and returns a boolean for whether the value
 ##### .number(value)
 ##### .boolean(value)
 ##### .symbol(value)
+##### .bigint(value)
 
 #### Built-in types
 
@@ -143,6 +144,8 @@ is.boundFunction(function () {});
 ##### .uint32Array(value)
 ##### .float32Array(value)
 ##### .float64Array(value)
+##### .bigInt64Array(value)
+##### .bigUint64Array(value)
 
 #### Structured data
 
diff --git a/source/index.ts b/source/index.ts
index 945b2e4..8b0de49 100644
--- a/source/index.ts
+++ b/source/index.ts
@@ -180,8 +180,8 @@ is.int32Array = isObjectOfType<Int32Array>(TypeName.Int32Array);
 is.uint32Array = isObjectOfType<Uint32Array>(TypeName.Uint32Array);
 is.float32Array = isObjectOfType<Float32Array>(TypeName.Float32Array);
 is.float64Array = isObjectOfType<Float64Array>(TypeName.Float64Array);
-is.bigint64Array = isObjectOfType<BigInt64Array>(TypeName.BigInt64Array);
-is.biguint64Array = isObjectOfType<BigUint64Array>(TypeName.BigUint64Array);
+is.bigInt64Array = isObjectOfType<BigInt64Array>(TypeName.BigInt64Array);
+is.bigUint64Array = isObjectOfType<BigUint64Array>(TypeName.BigUint64Array);
 
 is.arrayBuffer = isObjectOfType<ArrayBuffer>(TypeName.ArrayBuffer);
 is.sharedArrayBuffer = isObjectOfType<SharedArrayBuffer>(TypeName.SharedArrayBuffer);
diff --git a/test/test.ts b/test/test.ts
index b0a9780..ce01004 100644
--- a/test/test.ts
+++ b/test/test.ts
@@ -326,15 +326,15 @@ const types = new Map<string, Test>([
 		typename: TypeName.Float64Array
 	}],
 	// TODO: Nodejs 10 only
-	// ['bigint64Array', {
-	// 	is: is.bigint64Array,
+	// ['bigInt64Array', {
+	// 	is: is.bigInt64Array,
 	// 	fixtures: [
 	// 		new BigInt64Array()
 	// 	],
 	// 	typename: TypeName.BigInt64Array
 	// }],
-	// ['biguint64Array', {
-	// 	is: is.biguint64Array,
+	// ['bigUint64Array', {
+	// 	is: is.bigUint64Array,
 	// 	fixtures: [
 	// 		new BigUint64Array()
 	// 	],
@@ -631,12 +631,12 @@ test('is.float64Array', t => {
 });
 
 // TODO: Nodejs 10 only
-// test('is.bigint64Array', t => {
-// 	testType(t, 'bigint64Array');
+// test('is.bigInt64Array', t => {
+// 	testType(t, 'bigInt64Array');
 // });
 
-// test('is.biguint64Array', t => {
-// 	testType(t, 'biguint64Array');
+// test('is.bigUint64Array', t => {
+// 	testType(t, 'bigUint64Array');
 // });
 
 test('is.arrayBuffer', t => {