diff --git a/Settings.md b/Settings.md
index b241d89..77c4861 100644
--- a/Settings.md
+++ b/Settings.md
@@ -5,9 +5,10 @@
 * [Apache](Apache)
 * [Caddy](Caddy-Webserver-Config)
 
-NOTE:
+## ROOT_URL / root-url !!
 - Docker/Source/Bundle like this, no quotes, big letters, underscore: `ROOT_URL=http://192.168.0.100`
 - Snap like this, single quotes, small letters: `root-url='http://192.168.0.100'`
+- See https://github.com/wekan/wekan/issues/4803
 
 Examples: