E.g.ifyouwanttoblockallcrawlersexceptfor[fediverse.network](https://fediverse.network/about) you can use
```
User-Agent:*
Disallow:/
User-Agent:crawler-us-il-1.fediverse.network
Allow:/
User-Agent:makhnovtchina.random.sh
Allow:/
```
##Thumbnail
Add`$static_dir/instance/thumbnail.jpeg`withyourselfieorotherneatpicture.Itwillbeavailableon`http://your-domain.tld/instance/thumbnail.jpeg` and can be used by external applications.