diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,5 +1,13 @@
 # Dynmap®  - dynamic web maps for Minecraft servers
 
+> **About this fork.** This repository tracks [Dynmap](https://github.com/webbukkit/dynmap)
+> with an added **NeoForge 1.21.1** build. The `main` branch mirrors the upstream
+> multi-platform project (Spigot/Paper, Forge, Fabric, and the original README below);
+> the **`neoforge-1.21.1`** branch holds the standalone NeoForge 1.21.1 port and its own
+> build/install instructions. For the canonical project, see
+> [webbukkit/dynmap](https://github.com/webbukkit/dynmap).
+
+
 # Jump around the README
 * [How to build](#how-to-build)
 * [What platforms are supported?](#what-platforms-are-supported)