diff --git a/README.md b/README.md
index cf1b0dd33..be5a547d6 100644
--- a/README.md
+++ b/README.md
@@ -299,7 +299,7 @@ It is generally recommended to enter the notes as Markdown as it makes the notes
 
 ## Custom CSS
 
-Rendered markdown can be customized by placing a userstyle file in the profile directory `~/.config/joplin-desktop/userstyle.css` (This path might be different on your device - check at the top of the Config screen for the exact path). This file supports standard CSS syntax. Note that this file is used only when display the notes, **not when printing or exporting to PDF**. This is because printing has a lot more restrictions (for example, printing white text over a black background is usually not wanted), so special rules are applied to make it look good when printing, and a userstyle.css would interfer with that.
+Rendered markdown can be customized by placing a userstyle file in the profile directory `~/.config/joplin-desktop/userstyle.css` (This path might be different on your device - check at the top of the Config screen for the exact path). This file supports standard CSS syntax. Joplin ***must*** be restarted for the new css to be applied, please ensure that Joplin is not closing to the tray, but is actually exiting. Note that this file is used only when display the notes, **not when printing or exporting to PDF**. This is because printing has a lot more restrictions (for example, printing white text over a black background is usually not wanted), so special rules are applied to make it look good when printing, and a userstyle.css would interfer with that.
 
 # Searching