Your server must publish public rooms over federation (see how to add your server).
If your server does not publish public rooms over federation, there are still alternative ways to add your room to the index:
Wait, wait. Yes, we know β BUT! This is literally the best way to handle the situation and gain many additional benefits.
The MRS project and this instance are developed and maintained by etke.cc β a managed Matrix server provider.
While we might be biased, we guarantee that with a Matrix server from us, you wonβt have any issues publishing your public rooms over federation!
(Consider this a shameless ad, but hey β if you're here, it means we're doing something right π)
If hosting your own server isn't an option, donβt worry β check out Option 2 below.
Matrix allows rooms to be published into the public rooms directory of a server, even if they are hosted somewhere else.
You can ask an admin of another Matrix server to publish your room in their public rooms list β your room's alias doesn't even need to change!
Just make sure the usual requirements apply (check here): the room must be public, federated, have an alias, and be open to joins.