diff --git a/readme.md b/readme.md
index b522922..e92c5c6 100644
--- a/readme.md
+++ b/readme.md
@@ -20,6 +20,29 @@ $ pip install -r requirements.txt
 
 and edit `.env` with credentials from https://www.ovh.com/auth/api/createToken
 
+This expects the file `/etc/bigbluebutton/bbb-webrtc-sfu/production.yml` to look like
+
+```
+freeswitch:
+  ip: 87.142.106.77
+  sip_ip: 127.0.0.1
+kurento:
+- ip: 192.168.2.47
+  url: ws://127.0.0.1:8888/kurento
+mediasoup:
+  plainRtp:
+    listenIp:
+      announcedIp: 87.142.106.77
+      ip: 0.0.0.0
+  webrtc:
+    listenIps:
+    - announcedIp: 87.142.106.77
+      ip: 0.0.0.0
+    - announcedIp: 192.168.2.47
+      ip: 0.0.0.0
+```
+
+
 ## run
 
 `dyndns-update ZONE SUBDOMAIN`