diff --git a/.jshintrc b/.jshintrc
index c07344f..eae03a4 100644
--- a/.jshintrc
+++ b/.jshintrc
@@ -63,6 +63,7 @@
   "node":true,
 
   "globals": {
+    "Promise":true
   },
 
   "predef": [
diff --git a/README.md b/README.md
index b062e27..ad15418 100644
--- a/README.md
+++ b/README.md
@@ -12,10 +12,39 @@
 
 ## Usage
 
+Function to hit a URL and stop as soon as headers are received i.e. do not fetch the body of the HTTP response.
+
+Useful for example for checking the size of a large file without downloading it. Uses GET HTTP method (or whatever method requested) rather than HEAD as some servers may not support HEAD, or not use cookies with HEAD etc.
+
+Returns a [Bluebird](https://www.npmjs.com/package/bluebird) Promise which resolves to the response object, or rejects with an error.
+
+Uses [got](https://www.npmjs.com/package/got) to make the HTTP request.
+
+### headers(url, [options])
+
+```js
+const headers = require('got-headers');
+
+headers('http://www.google.com').then(function(res) {
+	// Print headers object
+	console.log(res.headers);
+}).catch(function(err) {
+	// Print error
+	console.log('Error!', err);
+
+	// Print response object
+	console.log(err.res);
+});
+```
+
+`options` object is passed directly to [got](https://www.npmjs.com/package/got) - use any of got's options.
+
 ## Tests
 
 Use `npm test` to run the tests. Use `npm run cover` to check coverage.
 
+There are no tests at present but it seems to work fine!
+
 ## Changelog
 
 See [changelog.md](https://github.com/overlookmotel/got-headers/blob/master/changelog.md)
diff --git a/changelog.md b/changelog.md
index 57855bc..94a1afe 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,5 @@
 # Changelog
 
 ## Next
+
+* Initial release
diff --git a/lib/index.js b/lib/index.js
index c9054a8..22aac29 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -4,6 +4,34 @@
 
 'use strict';
 
+// Modules
+const got = require('got'),
+	Promise = require('bluebird');
+
 // Exports
-module.exports = function() {
+
+/**
+ * Hit URL and get headers only
+ * @param {string} url - URL
+ * @param {Object} [options] - Options object to pass to `got`
+ * @returns {Promise} - Bluebird Promise which resolves with response object
+ */
+module.exports = function(url, options) {
+	return new Promise((resolve, reject) => {
+		const stream = got.stream(url, options);
+
+		let req;
+		stream.on('request', _req => req = _req);
+
+		stream.on('response', res => {
+			req.abort();
+			resolve(res);
+		});
+
+		stream.on('error', (err, body, response) => {
+			err.body = body;
+			err.response = response;
+			reject(err);
+		});
+	});
 };
diff --git a/package.json b/package.json
index 9908989..a2e5269 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,8 @@
     "url": "https://github.com/overlookmotel/got-headers/issues"
   },
   "dependencies": {
+    "got": "^7.0.0",
+    "bluebird": "^3.5.0"
   },
   "devDependencies": {
     "chai": "^4.0.2",