diff --git a/Procfile b/Procfile
index 6f86b16..489b270 100644
--- a/Procfile
+++ b/Procfile
@@ -1 +1 @@
-web: node server.js
\ No newline at end of file
+web: node server.js
diff --git a/README.md b/README.md
index 4532697..d343349 100644
--- a/README.md
+++ b/README.md
@@ -383,3 +383,4 @@ Demo: https://reactredux-shoppingcart.herokuapp.com/
    37. app.get("/", (req, res) => res.sendFile(\_\_dirname + "/build/index.html"));
    38. git add . && git commit -m "publish"
    39. git push heroku
+
diff --git a/server.js b/server.js
index 256216c..16604a1 100644
--- a/server.js
+++ b/server.js
@@ -1,14 +1,18 @@
+// Import necessary libraries
 const express = require("express");
 const bodyParser = require("body-parser");
 const mongoose = require("mongoose");
 const shortid = require("shortid");
 
+// Create an instance of the Express application
 const app = express();
 app.use(bodyParser.json());
 
+// Serve static files from the "build" directory
 app.use("/", express.static(__dirname + "/build"));
 app.get("/", (req, res) => res.sendFile(__dirname + "/build/index.html"));
 
+// Connect to MongoDB using Mongoose
 mongoose.connect(
   process.env.MONGODB_URL || "mongodb://localhost/react-shopping-cart-db",
   {
@@ -18,6 +22,7 @@ mongoose.connect(
   }
 );
 
+// Define the Product model schema
 const Product = mongoose.model(
   "products",
   new mongoose.Schema({
@@ -30,22 +35,27 @@ const Product = mongoose.model(
   })
 );
 
+// Define routes for handling product-related operations
 app.get("/api/products", async (req, res) => {
+  // Retrieve all products from the database
   const products = await Product.find({});
   res.send(products);
 });
 
 app.post("/api/products", async (req, res) => {
+  // Create and save a new product based on the request body
   const newProduct = new Product(req.body);
   const savedProduct = await newProduct.save();
   res.send(savedProduct);
 });
 
 app.delete("/api/products/:id", async (req, res) => {
+  // Delete a product based on its ID
   const deletedProduct = await Product.findByIdAndDelete(req.params.id);
   res.send(deletedProduct);
 });
 
+// Define the Order model schema
 const Order = mongoose.model(
   "order",
   new mongoose.Schema(
@@ -73,7 +83,9 @@ const Order = mongoose.model(
   )
 );
 
+// Define routes for handling order-related operations
 app.post("/api/orders", async (req, res) => {
+  // Validate and save a new order based on the request body
   if (
     !req.body.name ||
     !req.body.email ||
@@ -86,14 +98,19 @@ app.post("/api/orders", async (req, res) => {
   const order = await Order(req.body).save();
   res.send(order);
 });
+
 app.get("/api/orders", async (req, res) => {
+  // Retrieve all orders from the database
   const orders = await Order.find({});
   res.send(orders);
 });
+
 app.delete("/api/orders/:id", async (req, res) => {
+  // Delete an order based on its ID
   const order = await Order.findByIdAndDelete(req.params.id);
   res.send(order);
 });
 
+// Set up the server to listen on the specified port
 const port = process.env.PORT || 5000;
-app.listen(port, () => console.log("serve at http://localhost:5000"));
+app.listen(port, () => console.log("Server is running at http://localhost:5000"));