diff --git a/thunderbird/README.md b/thunderbird/README.md
index a6140e0..b310792 100644
--- a/thunderbird/README.md
+++ b/thunderbird/README.md
@@ -2,6 +2,7 @@
 
 - Open `Config Editor...` and set `toolkit.legacyUserProfileCustomizations.stylesheets` to `true`.
 - Place `userChrome.css` in `~/.thunderbird/[random letters and numbers].default/chrome/`.
+- Place `userContent.css` in `~/.thunderbird/[random letters and numbers].default/chrome/`.
 - Set *Thunderbird Start Page* to `file:///home/odd/dotfiles/thunderbird/newTab.html`.
 - Set `tbkeys-lite` bindings on the extension preferences page.