Update README.md

README.md

@@ -76,6 +76,8 @@ the past, to can begin one new experiment/showcase... and then:
             	...
 
    For more details you can consult <a href="https://subspace.com/resources/stun-101-subspace">that</a> tutorial(wiki: <a href="https://en.wikipedia.org/wiki/NAT_traversal">NAT traversal</a>).
+   It should also be mentioned that "Transversal NAT" is not the only method/approach to penetrate or avoid behind firewalls, proxies or such protection/security barriers/walls that are (or are already in operation) ) in ...
+   our end-to-end (e2e) communication path
 
    Finally, if want to have and file-transfer facility and/or the recording of audio-conversation in your show-case then you can consult <a href="https://github.com/svarunan/serverless-webrtc/tree/master">that</a> original-repository
    (thanks a lot for this code)