diff --git a/index.js b/index.js
index aba0646..552481d 100644
--- a/index.js
+++ b/index.js
@@ -1,4 +1,7 @@
 'use strict';
+
+const util = require('util');
+
 const toString = Object.prototype.toString;
 const getObjectType = x => toString.call(x).slice(8, -1);
 const isOfType = type => x => typeof x === type; // eslint-disable-line valid-typeof
@@ -151,7 +154,7 @@ is.inRange = (x, range) => {
 		return x >= Math.min.apply(null, range) && x <= Math.max.apply(null, range);
 	}
 
-	throw new TypeError('Invalid range');
+	throw new TypeError(`Invalid range: ${util.inspect}`);
 };
 
 module.exports = is;
diff --git a/test.js b/test.js
index 4a6bf4e..316bb41 100644
--- a/test.js
+++ b/test.js
@@ -332,7 +332,15 @@ test('is.inRange', t => {
 		m.inRange(0);
 	});
 
+	t.throws(() => {
+		m.inRange(0, []);
+	});
+
 	t.throws(() => {
 		m.inRange(0, [5]);
 	});
+
+	t.throws(() => {
+		m.inRange(0, [1, 2, 3]);
+	});
 });