diff --git a/.gitignore b/.gitignore
index d8715c4..45544a2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@ dist/
 .DS_Store
 .env
 docker/.env
+sync.sh
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..f97cc2c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,49 @@
+# Full Diagram — webtrees Chart Module
+
+A [MyHeritage](https://www.myheritage.com/) "Family View" style visualization for [webtrees](https://webtrees.net/), showing direct ancestors and descendants as well as siblings and their spouses in a single interactive diagram.
+
+## Features
+
+- Combined ancestor and descendant tree in one view
+- Siblings and their spouses displayed alongside the main lineage
+- Interactive SVG diagram with pan and zoom (D3.js + ELK layout)
+- Configurable generation limits for ancestors and descendants
+- Available as both a standalone chart and an individual-page tab
+- Hover cards with summary information
+
+## How the Layout Works
+
+The diagram is laid out using [ELK](https://www.eclipse.dev/elk/) (Eclipse Layout Kernel) and its layered (Sugiyama) algorithm. The family tree is modelled as a directed graph where each person is a node and couples are connected through small invisible "union" nodes. ELK's layered algorithm assigns each node to a horizontal layer (one per generation), minimises edge crossings between layers, and positions nodes to keep connecting edges short.
+
+Spouses are fed into ELK as adjacent nodes with model-order constraints so they stay next to each other. After ELK computes X positions, Y coordinates are snapped to a strict generation grid and orthogonal bus-line connectors (couple bars, vertical drops, horizontal child rails) are drawn manually rather than relying on ELK's edge routing.
+
+## Requirements
+
+- [webtrees](https://webtrees.net/) 2.2+
+- PHP 8.2+
+
+## Installation
+
+1. Download the [latest release](../../releases/latest).
+2. Extract it into the `modules_v4/` directory of your webtrees installation so the structure is `modules_v4/webtrees-full-diagram/module.php`.
+3. Go to **Control panel > Modules > Charts** and enable "Full Diagram".
+
+## Development
+
+```bash
+# Start the local dev environment (webtrees + MariaDB)
+cd docker && docker compose up -d
+
+# Install JS dependencies
+npm install
+
+# Build the JS bundle (watches for changes)
+npm run watch
+
+# One-off production build
+npm run build
+```
+
+## License
+
+This program is free software: you can redistribute it and/or modify it under the terms of the [GNU Affero General Public License](LICENSE) as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
diff --git a/composer.json b/composer.json
index 4101c62..4d1d8c3 100644
--- a/composer.json
+++ b/composer.json
@@ -1,7 +1,7 @@
 {
     "name": "alex/webtrees-full-diagram",
     "description": "Full family diagram chart module for webtrees — shows ancestors, descendants, and siblings in a single interactive SVG diagram.",
-    "license": "GPL-3.0-or-later",
+    "license": "AGPL-3.0-or-later",
     "type": "webtrees-module",
     "keywords": [
         "webtrees",
diff --git a/module.php b/module.php
index d8ddabb..f565cf2 100644
--- a/module.php
+++ b/module.php
@@ -3,7 +3,7 @@
 /**
  * Full Diagram module for webtrees.
  *
- * @license GPL-3.0-or-later
+ * @license AGPL-3.0-or-later
  */
 
 declare(strict_types=1);
diff --git a/sync.sh b/sync.sh
deleted file mode 100755
index 7d16fa6..0000000
--- a/sync.sh
+++ /dev/null
@@ -1,13 +0,0 @@
-#!/bin/sh
-rsync -avz --delete \
-  --exclude 'node_modules' \
-  --exclude '.git' \
-  --exclude 'docker' \
-  --exclude 'build' \
-  --exclude 'resources/js/modules' \
-  --exclude 'rollup.config.js' \
-  --exclude 'package.json' \
-  --exclude 'package-lock.json' \
-  --exclude 'CLAUDE.md' \
-  --exclude 'sync.sh' \
-  ./ root@bocken.org:/usr/share/webapps/webtrees/modules_v4/full-diagram/