diff --git a/backend/.env.example b/backend/.env.example
index 5b1d621..ec910fc 100644
--- a/backend/.env.example
+++ b/backend/.env.example
@@ -1,3 +1,15 @@
+# use email only if you want to send emails
+# email id used for sending mails
+EMAIL_ID=
 MAIL_SERVER_PASSWORD=
+
+# host that are allowed in backend
 CORS_ALLOWED_HOST=http://localhost:5173
-EMAIL_ID=
\ No newline at end of file
+
+# connection string to connect to MongoDB database. Can be local or MongoDB Atlas
+CONNECTION_STRING=
+
+PORT=8080
+
+# path to the chess engine
+CHESS_ENGINE_PATH=
\ No newline at end of file