diff --git a/synapse.subdomain.conf.sample b/synapse.subdomain.conf.sample
index dadcb1e..d92e4dc 100644
--- a/synapse.subdomain.conf.sample
+++ b/synapse.subdomain.conf.sample
@@ -1,8 +1,8 @@
-## Version 2021/10/02
+## Version 2021/10/03
 
 server {
-    listen 443 ssl;
-    listen [::]:443 ssl;
+    listen 443 ssl http2;
+    listen [::]:443 ssl http2;
 
     # For the federation port
     listen 8448 ssl http2 default_server;