diff --git a/README.md b/README.md
index 0551ced..b959a03 100644
--- a/README.md
+++ b/README.md
@@ -7,52 +7,99 @@
 
 ## Description
 
-This script mirrors automatically the public repositories from a github-user or github-organization to your gitea server.
-It will - once started - create a mirrored repository under a given token for a gitea user fully automatically.
+`mirror-to-gitea` automatically creates repository mirrors from a Github User to your gitea server. The hard work (
+continous mirroring) is done by Gitea on a continuous basis.
 
-Example:
-A github user `github-user` has public repositories `dotfiles` and `zsh-config`.
-Starting the script with a gitea token for the account `gitea-user` will create the following mirror repositories:
+### Modes
+
+There a different usage modes:
+
+1. mirror **only public** repositories: No authentication on Github required. You may utilize an optional Github token
+   to avoid rate limits
+2. Mirror **public and private** repositories: Authentication for Github required.
+
+### Prerequisites
+
+#### Mandatory
+
+- Something to mirror from Github (repositories from a Github user)
+- An application token for a gitea instance
+
+#### Optional
+
+- A Github token (to *avoid rate limits* or to *mirror private repositories*)
+
+### Examples
+
+#### Mirror public repositories
+
+A github user `github-user` has the public repositories `dotfiles` and `zsh-config`. Starting the script with a gitea
+token for the account `gitea-user` will create the following mirror repositories:
 
 - github.com/github-user/dotfiles ← some-gitea.url/gitea-user/dotfiles
 - github.com/github-user/zsh-config ← some-gitea.url/zsh-config/dotfiles
 
 The mirror settings are default by your gitea instance.
 
-## Prerequisites
+#### Mirror private repositories
+
+You obtained a github token for `github-user` which has a public repository `public-example` a private
+repository `private-example`. Running the mirroring process for `gitea-user` will create the following mirror
+repositories:
+
+- github.com/github-user/public-example ← some-gitea.url/gitea-user/public-example
+- github.com/github-user/private-example ← some-gitea.url/zsh-config/private-example
+
+The mirror settings are default by your gitea instance.
+
+## Run public repository mirrors
+
+### Parameters
+
+#### Mirror public repositories
+
+##### Mandatory
+
+- `GITHUB_USERNAME` name of user with public repos should be mirrored
+- `GITEA_URL` url of your gitea server
+- `GITEA_TOKEN` token for your gitea user
 
-- Something to mirror (a github user or organization with public repos)
-- Gitea instance up and running
-- User for Gitea with generated token
-- Docker
+##### Optional
 
-## Run it
+- `MIRROR_REPOSITORIES` `PUBLIC` (optional, is default)
+- `GITHUB_TOKEN` Github personal access token (optional to avoid rate limits)
 
 ```sh
 docker container run \
  -d \
  --restart always \
- -e GITHUB_USERNAME=github-user \
+ -e MIRROR_REPOSITORIES='PUBLIC' \
+ -e GITHUB_USERNAME='github-user' \
+ -e GITHUB_TOKEN='<optional-github-token>' \
  -e GITEA_URL=https://some-gitea.url \
- -e GITEA_TOKEN=please-exchange-with-token \
+ -e GITEA_TOKEN='<gitea-token>' \
  jaedle/mirror-to-gitea:latest
 ```
 
-This will a spin up a docker container running infinite which will try to mirror all your repositories once every hour to your gitea server.
+This will a spin up a docker container running infinite which will try to mirror all your repositories once every hour
+to your gitea server.
 
-### Parameters
+## Run private repository mirrors
 
-- `GITHUB_USERNAME` name of user or organization which public repos should be mirrored
-- `GITHUB_TOKEN` [GitHub personal access token](https://docs.github.com/en/free-pro-team@latest/github/authenticating-to-github/creating-a-personal-access-token) (optional)
+##### Mandatory
+
+- `MIRROR_MODE` 'PRIVATE_AND_PUBLIC'
+- `GITHUB_TOKEN` Github personal access token
 - `GITEA_URL` url of your gitea server
 - `GITEA_TOKEN` token for your gitea user
 
-## Things to do
-
-- refactoring
-- think about how to test
-- configurable interval
-- better logging
-- use github token to solve problems with rate limits
-- add gitlab support
-- and so on..
+```sh
+docker container run \
+ -d \
+ --restart always \
+ -e MIRROR_MODE='PRIVATE_AND_PUBLIC' \
+ -e GITHUB_TOKEN='<github-token>' \
+ -e GITEA_URL=https://some-gitea.url \
+ -e GITEA_TOKEN=please-exchange-with-token \
+ jaedle/mirror-to-gitea:latest
+```