diff --git a/Home.md b/Home.md
index 5d0bf71..6c5e6bb 100644
--- a/Home.md
+++ b/Home.md
@@ -59,6 +59,7 @@ or
 docker exec -it <container_id> sudo -Eu app php8 /var/www/html/tt-rss/update.php --help
 ```
 
+Note: `sudo -E` is needed to keep environment variables.
 
 ### How do I add plugins and themes?