diff --git a/Docker-compose-installation.md b/Docker-compose-installation.md
index 52a541b..f036bb2 100644
--- a/Docker-compose-installation.md
+++ b/Docker-compose-installation.md
@@ -93,6 +93,7 @@ Port: 8080 (unless a different port is specified in docker-compose.yml)
 
 Custom header tab:
 X-Forwarded-Proto             https
+[Create v] >> Websocket
 ```
 Control panel >> Security >> Certificates
 Create a Let's Encrypt certificate for the chosen domain ```egw.example.org``` (LE requires 80 AND 443!)