diff --git a/README.md b/README.md
index 1203394..4f50f87 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,10 @@ You can desactivate "Developer Tools" by commenting `win.webContents.openDevTool
 
 **Your application is optimised. Only /dist folder and node dependencies are included in the executable.**
 
+## You want to use a specific lib (like rxjs) in electron main thread ?
+
+You can to this! Just by importing your library in npm dependencies (not devDependencies) with `npm install --save`. It will be loaded by electron during build phase and added to the final package. Then use your librairy by importing it in `main.ts` file. Easy no ?
+
 ## Browser mode
 
 Maybe you want to execute the application in the browser with hot reload ? You can do it with `npm run ng:serve:web`.  
diff --git a/main.ts b/main.ts
index 1433b7c..44f897b 100644
--- a/main.ts
+++ b/main.ts
@@ -2,9 +2,6 @@ import { app, BrowserWindow, screen } from 'electron';
 import * as path from 'path';
 import * as url from 'url';
 
-import { of } from 'rxjs';
-import { timeout } from 'rxjs/operators';
-
 let win, serve;
 const args = process.argv.slice(1);
 serve = args.some(val => val === '--serve');
@@ -45,8 +42,6 @@ function createWindow() {
     win = null;
   });
 
-  of(2000).pipe(timeout(1000))
-    .subscribe(val => console.log(`ES5 works fine : @${val}`));
 }
 
 try {
diff --git a/package.json b/package.json
index 434bb5f..e3d05ca 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "angular-electron",
-  "version": "4.2.0",
+  "version": "4.2.1",
   "description": "Angular 6 with Electron (Typescript + SASS + Hot Reload)",
   "homepage": "https://github.com/maximegris/angular-electron",
   "author": {
@@ -37,7 +37,8 @@
     "test": "npm run postinstall:web && ng test",
     "e2e": "npm run postinstall:web && ng e2e"
   },
-  "dependencies": {},
+  "dependencies": {
+  },
   "devDependencies": {
     "@angular-devkit/build-angular": "0.6.3",
     "@angular/cli": "6.1.2",