updated readme

README.md

@@ -12,13 +12,15 @@ This project demonstrates how to send and receive _cross-chain messages_ using t
 
 - [Foundry installed](https://book.getfoundry.sh/getting-started/installation)
 - [Node.js and npm installed](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm)
-- You will need testnet tokens in both chains ([Fuji](https://faucets.chain.link/fuji) / [Alfajores](https://faucets.chain.link/celo-alfajores-testnet)) to complete transactions.
+- You will need testnet tokens in both chains ([Fuji](https://faucets.chain.link/fuji) / [Alfajores](https://faucets.chain.link/celo-alfajores-testnet)) to complete transactions
 - An `.env` file with your private key:
 
 ```bash
 PRIVATE_KEY=0x...
 ```
 
+- The `chains.json` file requires the details of the source and target chains. For a complete list of contract addresses needed to populate this file, visit the [contract addresses page](https://wormhole.com/docs/build/reference/) from the Wormhole Documentation
+
 ### Quickstart
 
 **1. Clone the repository:**