diff --git a/README.md b/README.md
index 6c1405e..484b782 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ This repository contains the backend implementation for the Ecomm e-commerce app
 
 ## Description
 
-This is a simple e-commerce backend application built with Node.js, TypeScript, Express.js, MongoDB, and Docker. It provides API endpoints to manage users and products.
+This is a simple e-commerce backend application built with Node.js, TypeScript, Express.js, MongoDB, and Docker. It provides API endpoints to manage users, products and cart of user.
 
 ## Table of Contents
 
@@ -129,3 +129,25 @@ status code 404
   "Product not found."
 }
 ````
+
+# Cart
+Add Product to Cart - POST /cart
+Adds a product to cart.
+(authentication required)
+
+Request Body
+```
+{
+  "productId": "string"
+}
+```
+Response Body
+status code 200
+```
+{
+  Cart :{
+    "{ProductId}": Quantity
+  }
+}
+```
+