diff --git a/lib/Semaphore.js b/lib/Semaphore.js
index 9dbc5b1..a7a7361 100644
--- a/lib/Semaphore.js
+++ b/lib/Semaphore.js
@@ -16,7 +16,6 @@ Semaphore.prototype.wait = function (cb) {
 	}
 };
 
-
 Semaphore.prototype.signal = function () {
 	this._count += 1;
 
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..99f8e83
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1214 @@
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+          "integrity": "sha1-fB0W1nmhu+WcoCys7PsBHiAfWh8=",
+          "dev": true
+        },
+        "cliui": {
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+          "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
+          "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
+          "dev": true,
+          "requires": {
+            "string-width": "1.0.2",
+            "strip-ansi": "3.0.1",
+            "wrap-ansi": "2.1.0"
+          }
+        },
+        "window-size": {
+          "version": "0.1.4",
+          "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.4.tgz",
+          "integrity": "sha1-+OGqHuWlPsW/FR/6CXQqatdpeHY=",
+          "dev": true
+        }
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index 2942d16..980889a 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
   ],
   "main": "index.js",
   "scripts": {
-    "test": "tape test/*.js | tap-spec",
+    "test": "tape test/*.js promise/test/*.js | tap-spec",
     "cover": "rm -rf .nyc_output && nyc --silent --all tape test/*.js > /dev/null 2>&1 && nyc report"
   },
   "repository": "https://github.com/Wizcorp/locks",
diff --git a/promise/index.js b/promise/index.js
new file mode 100644
index 0000000..57c12e2
--- /dev/null
+++ b/promise/index.js
@@ -0,0 +1,9 @@
+var Semaphore = require('./lib/SemaphorePromise');
+
+
+exports.Semaphore = Semaphore;
+
+
+exports.createSemaphore = function (initialCount) {
+	return new Semaphore(initialCount);
+};
diff --git a/promise/lib/SemaphorePromise.js b/promise/lib/SemaphorePromise.js
new file mode 100644
index 0000000..cf0dd4c
--- /dev/null
+++ b/promise/lib/SemaphorePromise.js
@@ -0,0 +1,17 @@
+var Semaphore = require('../../lib/Semaphore');
+
+function SemaphorePromise (initialCount) {
+	this._count = initialCount || 1;
+	this._waiting = [];
+}
+
+module.exports = SemaphorePromise;
+
+SemaphorePromise.prototype.wait = function () {
+	var self = this;
+	return new Promise(function (resolve, reject) {
+		self._wait(resolve);
+	});
+}
+SemaphorePromise.prototype.signal = Semaphore.prototype.signal
+SemaphorePromise.prototype._wait = Semaphore.prototype.wait
diff --git a/promise/test/semaphorePromise.js b/promise/test/semaphorePromise.js
new file mode 100644
index 0000000..5a552a3
--- /dev/null
+++ b/promise/test/semaphorePromise.js
@@ -0,0 +1,48 @@
+var locks = require('../');
+var test = require('tape');
+
+function testPromise(t, cb) {
+	var availableResources = 2;
+	var parallelRunning = 0;
+	var executionCount = 0;
+	var sem = locks.createSemaphore(availableResources);	// 2 available resources
+
+	function fn() {
+		if (Math.random() < 0.5) {
+			process.nextTick(function () {
+				sem.signal();
+				parallelRunning--;
+			});
+		} else {
+			sem.signal();
+			parallelRunning--;
+		}
+	}
+
+	var prom = Promise.resolve();
+	var maxParallel = 0;
+	for (var i = 0; i < 100; i++) {
+		prom = prom.then(function () {
+			maxParallel = (parallelRunning > maxParallel ? parallelRunning : maxParallel);
+			parallelRunning++;
+			executionCount++;
+			return sem.wait().then(fn);
+		});
+	}
+
+	prom.then(() => {
+		t.ok(maxParallel > 0 && maxParallel <= availableResources, 'Ensure parallelism level is under the resource limit')
+		t.equal(executionCount, 100, 'ensure execution count')
+		t.equal(sem._waiting.length, 0, 'Nobody waiting');
+		cb();
+	}).catch((e) => {
+		cb(e);
+	})
+}
+
+
+test('Semaphore Promise', function (t) {
+	testPromise(t, function () {
+		t.end();
+	});
+});