diff --git a/matrix/synapse/README.md b/matrix/synapse/README.md
index 1e9f4ef..423a491 100644
--- a/matrix/synapse/README.md
+++ b/matrix/synapse/README.md
@@ -403,3 +403,22 @@ able to set these, of course. But when you use LDAP, which provides these
 values, you don't want users to change those.
 
 See for more options [Synapse's documentation](https://element-hq.github.io/synapse/latest/usage/configuration/config_documentation.html#registration).
+
+
+# TURN
+
+Check for more information about [how to configure the TURN
+server](../coturn). Once you've set up your TURN server, configure it in
+Synapse, in `conf.d/turn.yaml`:
+
+```
+turn_shared_secret: "<long random string>"
+turn_uris:
+  - "turn:turn.matrixdev.example.com?transport=udp"
+  - "turn:turn.matrixdev.example.com?transport=tcp"
+turn_user_lifetime: 86400000
+turn_allow_guests: true
+```
+
+Restart Synapse to activate this bit.
+