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@@ -1,13 +1,34 @@
-# Tansa: LAN service discovery over IPv6 multicast
+# Tansa: Serverless LAN service discovery over IPv6
 
 [![codecov](https://codecov.io/github/seamlik/tansa/graph/badge.svg?token=AH6YGZOMJM)](https://codecov.io/github/seamlik/tansa)
 
-This project is an opinionated solution of multicast discovery.
+This project is an opinionated solution of service discovery within a IPv6-enabled LAN.
 Written in pure Rust, it is [cross-platform](https://doc.rust-lang.org/nightly/rustc/platform-support.html) and is suitable to be a unified and portable solution for an application planning to span all major devices like laptops, smartphones and more.
+Unlike solutions such as [DNS Service Discovery](http://dns-sd.org),
+applications using this solution do not rely on any server/daemon running on the operating system.
 
 This project offers both a crate and a CLI application.
 However, I will not publish it to any public registry since it is highly experimental.
 
+## Technologies under the hood
+
+### Multicast
+
+Service discovery is mostly implemented by exchanging multicast packets on a rendezvous address.
+
+### IP neighbors
+
+When multicast is unavailable, services on other devices are naturally undiscoverable.
+However, devices connected directly to the host device are still discoverable as IP neighbors.
+Applications can still communicate with each other but over link-local addresses.
+
+This scenario can happen, for example, when 2 Android smartphones are connected via a hotspot or even Wi-Fi Direct.
+In this case, no other device exists within the LAN, but applications on the smartphones can still communicate.
+
+This feature relies on the operating system. Current we support these operating systems:
+
+* Windows (using [PowerShell](https://learn.microsoft.com/powershell/module/nettcpip/get-netneighbor?view=windowsserver2022-ps))
+
 ## Project name meaning
 
-Based on Japanese 探索 with pronounciation "tansaku" meaning "discovery".
+Based on Japanese "探索" with pronounciation "tansaku" meaning "discovery".