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@@ -1,5 +1,7 @@
 # untis-ics-sync
 
+[![Node CI](https://github.com/bddvlpr/untis-ics-sync/actions/workflows/node-ci.yaml/badge.svg)](https://github.com/bddvlpr/untis-ics-sync/actions/workflows/node-ci.yaml) [![Docker CD](https://github.com/bddvlpr/untis-ics-sync/actions/workflows/docker-cd.yaml/badge.svg)](https://github.com/bddvlpr/untis-ics-sync/actions/workflows/docker-cd.yaml)
+
 Serves a calendar API (ICS) for events provided from Untis.
 
 ## Use case
@@ -8,24 +10,55 @@ Some schools, universities, or workspaces do not enable the iCalendar API that U
 
 ## Installation
 
-Simply clone the repository and cd into it using `git clone https://github.com/bddvlpr/untis-ics-sync && cd untis-ics-sync`.
-If you're planning on using Docker, you could use the [bddvlpr/untis-ics-sync](https://hub.docker.com/r/bddvlpr/untis-ics-sync/) image from Docker Hub instead of the git repository.
-
-### Redis
-
-Version 0.7.0 and above require a redis server to be supplied in environment variables for queue processing. Either externally provide one, or define one in a Docker compose environment.
+### Using Docker
 
-### Setup SSL
+To deploy a quick Docker environment, fill in the target school credentials in `docker-compose.yml` and start the service by running `docker compose up -d`. Do note that if you'd like to use SSL, add any reverse proxy such as Nginx, Caddy or Traefik. View the table below for all possible environment variables.
 
-From version 0.2.6 and forward, SSL will not be natively supported anymore. Please use a reverse proxy instead of supplying the docker container with an SSL certificate.
+### Using NixOS
 
-### Using Docker
+Firstly add this repository to your flake's inputs.
+```nix
+{
+  inputs = {
+    # ...
+    untis-ics-sync.url = "github:bddvlpr/untis-ics-sync/<rev/version>";
+    untis-ics-sync.inputs.nixpkgs.follows = "nixpkgs";
+  };
 
-To run the app using Docker, copy over the `.env.example` to `.env` and fill in the parameters to get the app to work.
-Deploy the app (in a test environment) using `docker run -d --env-list .env -p 3000:3000 bddvlpr/untis-ics-sync`.
+  # ...
+}
+```
 
-### Using Yarn
+Secondly, enable the service. Please **DO NOT** use a writeText derivative as this will add your credentials to the Nix store. Use agenix or nix-sops. A local Redis service will automatically be started.
+```nix
+{
+  inputs,
+  ...
+}: {
+  imports = [
+    inputs.untis-ics-sync.nixosModules.default
+  ];
 
-To run the app using Yarn, copy over the `.env.example` to `.env` and fill in the parameters to get the app to work.
-Hot run the app using `yarn start:dev`, or build it using `yarn build`.
+  services.untis-ics-sync = {
+    enable = true;
+    envFile = ./; # Path to your credentials.
+  };
+}
+```
 
+## Environment
+| Name | Type | Default | Description |
+| - | - | - | - |
+| UNTIS_SCHOOLNAME | string | `null` | The school's (Untis) service name. |
+| UNTIS_USERNAME | string | `null` | The school's user name. |
+| UNTIS_PASSWORD | string | `null` | The school's password. |
+| UNTIS_BASEURL | string | `null` | The school's (Untis) base-url. |
+| BULL_REDIS_HOST | string | `null` | The Redis service hostname or address. |
+| BULL_REDIS_PORT | number | `null` | The Redis service port. |
+| BULL_REDIS_PATH | string | `null` | The Redis service path for Unix socket connection. |
+| CORS_ORIGIN | string | http://localhost:5173 | CORS Origin header to be sent for untis-ics-sync-ui. |
+| MAINTENANCE_TITLE | string | `null` | Maintenance notification title. |
+| MAINTENANCE_DESCRIPTION | string | `null` | Maintenance notification description. |
+| MAINTENANCE_LOCATION | string | `null` | Maintenance notification location. |
+| LESSONS_TIMETABLE_BEFORE | number | 7 | The amount of days to fetch before today. |
+| LESSONS_TIMETABLE_AFTER | number | 14 | The amount of days to fetch after today. |