Explain versioning

Author: TrafeX

README.md

@@ -39,6 +39,10 @@ Or mount your own code to be served by PHP-FPM & Nginx
 
     docker run -p 80:8080 -v ~/my-codebase:/var/www/html trafex/php-nginx
 
+## Versioning
+Major or minor changes are always published as a [release](https://github.com/TrafeX/docker-php-nginx/releases) with correspondending changelogs.
+The `latest` tag is automatically updated weekly to include the latests patches from Alpine Linux.
+
 ## Configuration
 In [config/](config/) you'll find the default configuration files for Nginx, PHP and PHP-FPM.
 If you want to extend or customize that you can do so by mounting a configuration file in the correct folder;