diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
deleted file mode 100644
index 93d155c..0000000
--- a/.github/FUNDING.yml
+++ /dev/null
@@ -1,2 +0,0 @@
-github: hackebein
-custom: paypal.me/hackebein
diff --git a/README.md b/README.md
index ad9bbdc..bdc34e0 100644
--- a/README.md
+++ b/README.md
@@ -1,69 +1,100 @@
-# What is Garry's Mod?
+# docker-garrysmod
 
-Garry's Mod is a physics sandbox. There aren't any predefined aims or goals. We give you the tools and leave you to play.
+A Docker image for running a [Garry's Mod](https://gmod.facepunch.com/) dedicated server, based on [hackebein/docker-srcds](https://github.com/Hackebein/docker-srcds).
 
-# Quick Start
+This repository is a fork of [Hackebein/docker-garrysmod](https://github.com/Hackebein/docker-garrysmod).
 
-## Basic
+Garry's Mod is a physics sandbox. There aren't any predefined aims or goals. The game gives you the tools and leaves you to play.
 
+The image is automatically built and pushed to:
+
+```text
+git.sh-edraft.de/sh-edraft.de/garrysmod
 ```
+
+## Table of Contents
+
+- [Quick Start](#quick-start)
+- [Enabling the Steam API](#enabling-the-steam-api)
+- [Public Listing](#public-listing)
+- [Workshop Collections](#workshop-collections)
+- [Custom Server Configuration](#custom-server-configuration)
+- [Example: Trouble in Terrorist Town (TTT)](#example-trouble-in-terrorist-town-ttt)
+- [Environment Variables](#environment-variables)
+- [Overlay Folder](#overlay-folder)
+- [Further Configuration](#further-configuration)
+
+## Quick Start
+
+Start a basic sandbox server on the default port (`27015`):
+
+```bash
 docker run -it \
     -p 27015:27015/tcp \
     -p 27015:27015/udp \
-    hackebein/garrysmod
+    git.sh-edraft.de/sh-edraft.de/garrysmod
 ```
 
-## Enable API
+## Enabling the Steam API
 
-```
+Some features (public server listing, Workshop downloads) require a Steam Web API key.
+
+```bash
 docker run -it \
     -p 27015:27015/tcp \
     -p 27015:27015/udp \
     -e "AUTHKEY=..." \
-    hackebein/garrysmod
+    git.sh-edraft.de/sh-edraft.de/garrysmod
 ```
-Get your [AUTHKEY](http://steamcommunity.com/dev/apikey)
 
-## Public
-If you have activated the API, this step happens automatically.
+Get your `AUTHKEY` from <http://steamcommunity.com/dev/apikey>.
 
-```
+## Public Listing
+
+If you've set `AUTHKEY`, your server is automatically listed publicly. Alternatively, you can register a Game Server Login Token (GLST) manually:
+
+```bash
 docker run -it \
     -p 27015:27015/tcp \
     -p 27015:27015/udp \
     -e "GLST=..." \
-    hackebein/garrysmod
+    git.sh-edraft.de/sh-edraft.de/garrysmod
 ```
 
-Get your [GLST](http://steamcommunity.com/dev/managegameservers) (`APPID: 4000`)
+Get your `GLST` from <http://steamcommunity.com/dev/managegameservers> (App ID: `4000`).
 
-## Workshop Collection
-Workshop access requires the API.
+## Workshop Collections
 
-```
+Downloading Workshop content requires `AUTHKEY` to be set.
+
+```bash
 docker run -it \
     -p 27015:27015/tcp \
     -p 27015:27015/udp \
     -e "AUTHKEY=..." \
     -e "WORKSHOPCOLLECTIONID=..." \
-    hackebein/garrysmod
+    git.sh-edraft.de/sh-edraft.de/garrysmod
 ```
 
-## Config
+## Custom Server Configuration
 
-```
+Mount your own `server.cfg` into the container:
+
+```bash
 docker run -it \
     -p 27015:27015/tcp \
     -p 27015:27015/udp \
     -v ./server.cfg:/opt/steam/garrysmod/cfg/server.cfg \
-    hackebein/garrysmod
+    git.sh-edraft.de/sh-edraft.de/garrysmod
 ```
 
-## Example for TTT
-```
-# make sure server.cfg file exists
+## Example: Trouble in Terrorist Town (TTT)
+
+```bash
+# make sure the server.cfg file exists
 touch ./server.cfg
-# start container
+
+# start the container
 docker run -it \
     -p 27015:27015/tcp \
     -p 27015:27015/udp \
@@ -74,38 +105,39 @@ docker run -it \
     -e "WORKSHOPDL=843519054" \
     -v ./server.cfg:/opt/steam/garrysmod/cfg/server.cfg \
     -v ./overlay:/opt/overlay \
-    hackebein/garrysmod
+    git.sh-edraft.de/sh-edraft.de/garrysmod
 ```
 
-Checkout [overlay](https://github.com/Hackebein/docker-srcds#overlay-folder) to overwrite files that are provided by Steam.
-Go to [Workshopp Collection](https://steamcommunity.com/sharedfiles/filedetails/?id=843519054)
+This uses the [TTT Workshop Collection](https://steamcommunity.com/sharedfiles/filedetails/?id=843519054), downloaded both server-side (`WORKSHOP`) and client-side (`WORKSHOPDL`).
 
-## Additional Environment
+## Environment Variables
 
-TICKRATE: Tickrate of server, **Attention:** Change not recommended
-(`Default: 66`)
+| Variable | Description | Default |
+| --- | --- | --- |
+| `AUTHKEY` | Steam Web API key. Required for the public server list and Workshop downloads. Get one at <http://steamcommunity.com/dev/apikey> | _(empty)_ |
+| `GLST` | Game Server Login Token for public listing. Get one at <http://steamcommunity.com/dev/managegameservers> (App ID `4000`). Not needed if `AUTHKEY` is set | _(empty)_ |
+| `GAME` | Game mod directory | `garrysmod` |
+| `GAMEMODE` | Gamemode to run on server start | `sandbox` |
+| `MAP` | Map to load on server start | `gm_flatgrass` |
+| `MAPGROUP` | Map group / map cycle group | `mg_active` |
+| `GAMETYPE` | Game type passed to the server | `0` |
+| `MAXPLAYERS` | Maximum number of players | `16` |
+| `TICKRATE` | Server tickrate. **Note:** changing this is not recommended | `66` |
+| `CONFIG` | Server config file, relative to `cfg/`. **Note:** changing this is not recommended | `server.cfg` |
+| `WORKSHOP` | Workshop collection ID to download for the server | _(empty)_ |
+| `WORKSHOPDL` | Workshop collection ID for clients to download before joining | _(empty)_ |
+| `CUSTOMPARAMETERS` | Additional raw command-line parameters appended to the server start command | _(empty)_ |
 
-GAMEMODE:
-(`Default: sandbox`)
+## Overlay Folder
 
-MAP: Map on Server start
-(`Default: gm_flatgrass`)
+You can use an overlay folder to add or overwrite files provided by Steam (e.g. addons, configs, maps) without rebuilding the image:
 
-CONFIG: Server config, **Attention:** Change not recommended
-(`Default: server.cfg`)
+```bash
+-v ./overlay:/opt/overlay
+```
 
-MAXPLAYERS: Max players
-(`Default: 16`)
+See [hackebein/docker-srcds: Overlay folder](https://github.com/Hackebein/docker-srcds#overlay-folder) for details.
 
-CUSTOMPARAMETERS: additional parameters
-(`Default: `)
+## Further Configuration
 
-WORKSHOP: downloads workshop collection for server
-(`Default: `)
-
-WORKSHOPDL: downloads workshop collection for client before joining
-(`Default: `)
-
-## More Options
-
-You can found more configuration options on the parent image page [hackebein/srcds](https://github.com/Hackebein/docker-srcds)
+This image inherits all environment variables and options from the parent image. See [hackebein/docker-srcds](https://github.com/Hackebein/docker-srcds) for the full list of available configuration options.