diff --git a/lib/response.js b/lib/response.js
index 53a70cc..c116e8e 100644
--- a/lib/response.js
+++ b/lib/response.js
@@ -26,6 +26,7 @@ function Response(body, opts) {
 	this.body = body;
 	this.bodyUsed = false;
 	this.size = opts.size;
+	this.ok = this.status >= 200 && this.status < 300;
 
 }
 
diff --git a/test/test.js b/test/test.js
index 344c63e..5b365fb 100644
--- a/test/test.js
+++ b/test/test.js
@@ -232,6 +232,7 @@ describe('node-fetch', function() {
 			expect(res.statusText).to.equal('Internal Server Error');
 			return res.text().then(function(result) {
 				expect(res.bodyUsed).to.be.true;
+				expect(res.ok).to.be.false;
 				expect(result).to.be.a('string');
 				expect(result).to.equal('server error');
 			});
@@ -444,6 +445,7 @@ describe('node-fetch', function() {
 		};
 		return fetch(url, opts).then(function(res) {
 			expect(res.status).to.equal(200);
+			expect(res.ok).to.be.true;
 		});
 	});