diff --git a/app/matrix/lib/synapse/homeserver.yaml b/app/matrix/lib/synapse/homeserver.yaml
index 05c4d00..3f05dc8 100644
--- a/app/matrix/lib/synapse/homeserver.yaml
+++ b/app/matrix/lib/synapse/homeserver.yaml
@@ -137,3 +137,7 @@
 password_config:
    enabled: false
 
+## Experimental Features ##
+experimental_features:
+  # Message threading support
+  msc3440_enabled: true