From 9f1244bc2cdbcfa3f6e39412e008695577b5c64e Mon Sep 17 00:00:00 2001
From: Makoto Kaji <40662025+mkaji@users.noreply.github.com>
Date: Wed, 6 Nov 2019 00:55:11 -0500
Subject: [PATCH] Update README.md

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 README.md | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/README.md b/README.md
index ec1d7a6..23b6d33 100644
--- a/README.md
+++ b/README.md
@@ -7,3 +7,14 @@ This demo shows audio/video communication and file sharing without sending data
 Since some browsers don't support WebRTC, I recommend using Google Chrome.
 
 https://makoto-dev.azurewebsites.net/
+
+## Signaling
+A signaling server resolves how to connect two peers over the internet.
+The signaling server in this demo uses SignalR to exchange the signaling information between the two peers.
+
+## Connectivity
+WebRTC connections may fail by restrictive networks behind NAT and firewalls.
+To cope with NAT and firewalls, STUN and TURN servers are commonly used.
+Since this demo uses only STUN server for traversal of NAT, the connection may fail if the two peers are in a different network and behind a network firewall or proxy.
+
+## Screenshots