diff --git a/src/app/datasources/helpers/store.helpers.ts b/src/app/datasources/helpers/store.helpers.ts
index dfb1e7a..1a2b0ab 100644
--- a/src/app/datasources/helpers/store.helpers.ts
+++ b/src/app/datasources/helpers/store.helpers.ts
@@ -10,6 +10,7 @@
   public updateCollection(event: IWSEvent, subject: BehaviorSubject<any>): BehaviorSubject<any> {
     const collection: any[] = subject.value;
     const index: number = _.findIndex(collection, (i) => {
+      // NOTE evaluate to use event.msg.pk
       return i.id === event.msg.object.id;
     });
     const exist: boolean = index > -1;
diff --git a/src/app/datasources/index.ts b/src/app/datasources/index.ts
index 4473541..535937b 100644
--- a/src/app/datasources/index.ts
+++ b/src/app/datasources/index.ts
@@ -4,6 +4,7 @@
 import {WebSocketEvent} from './websocket/global';
 import {SliceStore} from './stores/slices.store';
 import {StoreHelpers} from './helpers/store.helpers';
+import {SynchronizerStore} from './stores/synchronizer.store';
 
 export const xosRest = 'xosDataSources';
 
@@ -17,4 +18,5 @@
 angular
   .module('xosDataSources')
   .service('StoreHelpers', StoreHelpers)
+  .service('SynchronizerStore', SynchronizerStore)
   .service('SlicesStore', SliceStore);
diff --git a/src/app/datasources/stores/synchronizer.store.ts b/src/app/datasources/stores/synchronizer.store.ts
new file mode 100644
index 0000000..598d23c
--- /dev/null
+++ b/src/app/datasources/stores/synchronizer.store.ts
@@ -0,0 +1,26 @@
+/// <reference path="../../../../typings/index.d.ts"/>
+
+import {Subject} from 'rxjs/Rx';
+import {IWSEvent, IWSEventService} from '../websocket/global';
+
+export class SynchronizerStore {
+  static $inject = ['WebSocket'];
+  private _notifications: Subject<IWSEvent> = new Subject();
+  constructor(
+    private webSocket: IWSEventService
+  ) {
+    this.webSocket.list()
+      .filter((e: IWSEvent) => {
+        return e.msg.changed_fields.indexOf('backend_status') > -1;
+      })
+      .subscribe(
+        (event: IWSEvent) => {
+          this._notifications.next(event);
+        }
+      );
+  }
+
+  query() {
+    return this._notifications.asObservable();
+  }
+}