add cert generation hint

Author: SciLor

content/docs/tools/teddyCloud/setup/_index.md

@@ -15,6 +15,8 @@ An example [docker-compose.yaml can be found within the docker subdir.](https://
 Please beware that port 443 cannot be remapped and you cannot use a reverse proxy like nginx or traefik without passing through the TLS (complex, not recommended). The client certificate authentication needs to be done by teddyCloud. Also, there is no SNI. If you are using docker, you can use macvlan to give the teddyCloud container a dedicated IP address (recommended).
 
 ## Preparation
+First of all, prepare your teddyCloud installation. On first run, teddyCloud generates its certificates. During the generation you cannot access the webinterface. This can take several minutes! Be sure you check the log output!
+
 Please connect your Toniebox to your Wi-Fi and update its firmware. Many boxes are shipped with a production firmware that needs to be updated. Otherwise the box won't work as it should. It is not necessary to connect the box to the mytonies app/account. [Connect the box without the setup assistant.](https://support.tonies.com/hc/en-us/articles/4415294030482-How-do-I-set-up-a-Wi-Fi-connection-without-the-setup-assistant)
 
 ## Device specific preparation