diff --git a/.gitignore b/.gitignore
index b512c09..448c205 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-node_modules
\ No newline at end of file
+node_modules
+.directory
diff --git a/lib/types.js b/lib/types.js
index 055635b..1a12d3b 100644
--- a/lib/types.js
+++ b/lib/types.js
@@ -153,6 +153,23 @@ module.exports.Buffer = {
 	}
 }
 
+/*
+ * bigInt - big integers
+ */
+module.exports.bigint = {
+	write: function (BN, data, path) {
+		if (typeof(BN) !== 'bigint') {
+			throw new TypeError('Expected a BigInt at ' + path + ', got ' + BN)
+		}
+		console.log(BN.toString(16))
+		console.log(new Buffer(BN.toString(16), 'hex'));
+		exports.Buffer.write(new Buffer(BN.toString(16), 'hex'), data, path)
+	},
+	read: function (state) {
+		return BigInt('0x' + exports.Buffer.read(state).toString('hex'))
+	}
+}
+
 /*
  * either 0x00 or 0x01
  */
@@ -241,4 +258,4 @@ module.exports.date = {
 	read: function (state) {
 		return new Date(exports.uint.read(state))
 	}
-}
\ No newline at end of file
+}