diff --git a/call/README.md b/call/README.md
new file mode 100644
index 0000000..049dcb5
--- /dev/null
+++ b/call/README.md
@@ -0,0 +1,16 @@
+---
+gitea: none
+include_toc: true
+---
+
+# Element Call
+
+Element Call enables users to have audio and videocalls with groups, while
+maintaining full E2E encryption.
+
+It requires several bits of software and entries in .well-known/matrix/client
+
+This bit is for later, but here's a nice bit of documentation to start:
+
+https://sspaeth.de/2024/11/sfu/
+
diff --git a/nginx/README.md b/nginx/README.md
index 1f21583..62185a5 100644
--- a/nginx/README.md
+++ b/nginx/README.md
@@ -25,6 +25,15 @@ easy:
 apt install nginx python3-certbot-nginx
 ```
 
+Get your certificate:
+
+```
+certbot certonly --nginx --agree-tos -m systeemmail@procolix.com --non-interactive -d matrixdev.procolix.com
+```
+
+Substitute the correct e-mailaddress and FQDN, or course.
+
+
 # Configuration
 
 Almost all traffic should be encrypted, so a redirect from http to https seems
diff --git a/synapse/README.md b/synapse/README.md
index ac59da7..a0835d6 100644
--- a/synapse/README.md
+++ b/synapse/README.md
@@ -42,6 +42,28 @@ There are two different ways to configure Synapse, documented here:
 
 We'll use Synapse, using the workers architecture to make it scalable, flexible and reusable.
 
+
+## Listeners
+
+A fresh installation configures one listener, for both client and federation
+traffic. This listens on port 8008 on localhost (IPv4 and IPv6) and does not
+do TLS:
+
+```
+listeners:
+  - port: 8008
+    tls: false
+    type: http
+    x_forwarded: true
+    bind_addresses: ['::1', '127.0.0.1']
+    resources:
+      - names: [client, federation]
+        compress: false
+```
+
+
+
+
 # Database
 
 The default installation leaves you with an sqlite3 database. Nice for experimenting, but