Update README.md

Author: Ramy-Badr-Ahmed

README.md

@@ -8,7 +8,7 @@ A TLS server and client implementation using Node.js's tls module, operating at
 
 This implementation focuses on encrypted and authenticated communication, suitable for secure and trusted networks.
 
-The TCP variant is located here: [Node-TCP](https://github.com/Ramy-Badr-Ahmed/node-tcp)
+The TCP variant (Transport Layer of the OSI Model) is located here: [Node-TCP](https://github.com/Ramy-Badr-Ahmed/node-tcp)
 
 #### Use Cases: