diff --git a/README.md b/README.md
index 448997f..e04e7a4 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,22 @@
-# nginx ui    
+# nginx ui
 
-![Docker Image CI](https://github.com/schenkd/nginx-ui/workflows/Docker%20Image%20CI/badge.svg)     
+![Docker Image CI](https://github.com/schenkd/nginx-ui/workflows/Docker%20Image%20CI/badge.svg)
 
 ![Image of Nginx UI](https://i.ibb.co/XXcfsDp/Bildschirmfoto-2020-06-20-um-18-40-27.png)
 
-![Image of Nginx UI](https://i.ibb.co/XXcfsDp/Bildschirmfoto-2020-06-20-um-18-40-27.png)
+Table of Contents
+
+- [nginx ui](#nginx-ui)
+  - [Introduction](#introduction)
+  - [Setup](#setup)
+    - [Example](#example)
+    - [Docker](#docker)
+  - [UI](#ui)
+  - [Authentication](#authentication)
+    - [Configure the auth file](#configure-the-auth-file)
+    - [Configure nginx](#configure-nginx)
+
+## Introduction
 
 We use nginx in our company lab environment. It often happens that my
 colleagues have developed an application that is now deployed in our Stage
@@ -15,16 +27,31 @@ doing this for everyone anymore I thought a UI could help us all. If you
 feel the same way I wish you a lot of fun with the application and I am
 looking forward to your feedback, change requests or even a star.
 
-## setup
+## Setup
 
 Containerization is now state of the art and therefore the application is
 delivered in a container.
 
-### docker
+### Example
+
+- `-d` run as deamon in background
+- `--restart=always` restart on crash or server reboot
+- `--name nginxui` give the container a name
+- `-v /etc/nginx:/etc/nginx` map the hosts nginx directory into the container
+- `-p 8080:8080` map host port 8080 to docker container port 8080
+
+```bash
+docker run -d --restart=always --name nginxui -v /etc/nginx:/etc/nginx -p 8080:8080 schenkd/nginx-ui:latest
+```
+
+### Docker
 
 Repository @ [DockerHub](https://hub.docker.com/r/schenkd/nginx-ui)
 
+Docker Compose excerpt
+
 ```yaml
+# Docker Compose excerpt
 services:
   nginx-ui:
     image: schenkd/nginx-ui:latest
@@ -47,3 +74,43 @@ into the Nginx UI Main Config menu item.
 
 Adding a domain opens an exclusive editing window for the configuration
 file. This can be applied, deleted and enabled/disabled.
+
+## Authentication
+
+[BasicAuth with nginx](https://docs.nginx.com/nginx/admin-guide/security-controls/configuring-http-basic-authentication/)
+
+In general, this app does not come with authentication. However, it is easy to setup basic auth to restrict unwanted access.
+Here is how this can be done when using nginx.
+
+### Configure the auth file
+
+1. Verify that `apache2-utils` (Debian, Ubuntu) or `httpd-tools` (RHEL/CentOS/Oracle Linux) is installed
+2. Run the htpasswd utility to create a new user and set a passwort.
+    - Make sure, that the directory exists
+    - Remove the `-c` flag, if you have created a user before, since it creates the inital user/passwort file
+    - `sudo htpasswd -c /etc/apache2/.htpasswd user1`
+
+### Configure nginx
+
+The following example adds basic auth to our nginxui app running in a docker container with a mapped port 8080.
+In this case, it will be accessible via nginx.mydomain.com
+
+```none
+server {
+    server_name nginx.mydomain.com;
+
+    location / {
+        proxy_pass http://127.0.0.1:8080/;
+    }
+
+    auth_basic "nginxui secured";
+    auth_basic_user_file /etc/apache2/.htpasswd;
+
+    # [...] ommited ssl configuration
+}
+```
+
+1. Add above nginx conf to your `/etc/nginx/my.conf` file
+2. Run `nginx -t` to make sure, that your config is valid
+3. Run `systemctl restart nginx` (or equivalent) to restart your nginx and apply the new settings
+4. Your nginx ui is now accessible at nginx.mydomain.com and will correctly prompt for basic auth