diff --git a/README.md b/README.md
index 80de251..166c854 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,12 @@ npm install mongoose
 npm install compression
 ```
 
+```md
+This app is a progressive web application so it uses :
+manifest.webmanifest
+service-worker.js
+```
+
 ## Heroku deployment
 
 Create heroku app using these commands