diff --git a/main.js b/main.js
index ce5de94..1e7ae7d 100644
--- a/main.js
+++ b/main.js
@@ -7,5 +7,5 @@ define(function (require, exports, module) {
 
     require('./services/injector').init();
 
-    //require('./services/onlineTracking').init();
+    require('./services/onlineTracking').init();
 });
diff --git a/package.json b/package.json
index 6354463..6a4d6c4 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
     "title": "Documents Toolbar",
     "description": "Adds toolbar with a list of open documents on the top of the editor.",
     "homepage": "https://github.com/dnbard/brackets-documents-toolbar",
-    "version": "0.1.0",
+    "version": "0.1.1",
     "author": "Alex Bardanov <dnbard@gmail.com>",
     "license": "MIT",
     "engines": {
diff --git a/services/onlineTracking.js b/services/onlineTracking.js
new file mode 100644
index 0000000..eac9387
--- /dev/null
+++ b/services/onlineTracking.js
@@ -0,0 +1,64 @@
+// This is example of a client for extenstion online tracking service
+// Part of Brackets Extension Rating extension by Alex Bardanov
+// https://github.com/dnbard/brackets-extension-rating
+
+// use require('./onlineTrackingClient').init() to activate tracking
+
+define(function(require, exports){
+    var trackingServiceUrl = 'http://brackets-online.herokuapp.com/',
+        // http://brackets-online.herokuapp.com/ is an address of default tracking service
+        // Change it if you use self-hosting instance of online tracking service
+        appToken = '53eca7616073b96ad100017a',
+        // read https://github.com/dnbard/brackets-extension-rating/wiki/Online-and-max-users-counters-in-this-extension
+        // to learn on how to obtain an application token for your extension
+        mins60 = 60 * 60 * 1000,
+        mins5 = 5 * 60 * 1000,
+        keyId = 'ext-online-id';
+
+    function tick(){
+        var userId = getUserId(appToken, keyId),
+            url;
+
+        if (userId){
+            url = trackingServiceUrl + 'tick/' + appToken + '/' + userId;
+        } else {
+            url = trackingServiceUrl + 'tick/' + appToken;
+        }
+
+        $.ajax({ url: url })
+            .success(function(data){
+                //TODO: create complex model of data in local storage to support any number of extensions
+                if (data && data !== 'OK' && data !== 'ERROR'){
+                    saveUserId(data, appToken, keyId);
+                }
+            }).error(function(){
+                console.log('Can\'t track online status, retry in 5 mins');
+                setTimeout(tick, mins5);
+            });
+    }
+
+    function init(){
+        tick();
+        setInterval(tick, mins60);
+    }
+
+    function getUserId(appToken, keyId){
+        if (typeof appToken !== 'string' || typeof keyId !== 'string'){
+            throw new Error('Invalid argument');
+        }
+
+        return JSON.parse(localStorage.getItem(keyId) || '{ }')[appToken];
+    }
+
+    function saveUserId(id, appToken, keyId){
+        if (typeof id !== 'string' || typeof appToken !== 'string' || typeof keyId !== 'string'){
+            throw new Error('Invalid argument');
+        }
+
+        var obj = JSON.parse(localStorage.getItem(keyId) || '{ }');
+        obj[appToken] = id;
+        localStorage.setItem(keyId, JSON.stringify(obj));
+    }
+
+    exports.init = init;
+});