diff --git a/README.md b/README.md
index 6e0b857..bfea74c 100644
--- a/README.md
+++ b/README.md
@@ -21,6 +21,7 @@ pip3 install --user matrix-client
 ## Prod
 
 With a proxyta.net:
+(don't forget about `CHATONS_DOMAIN`, otherwise you will stay on `localhost`)
 
 ```
 docker-compose up -d