diff --git a/Setup.md b/Setup.md
index 45ac40c..8855249 100644
--- a/Setup.md
+++ b/Setup.md
@@ -42,4 +42,5 @@ If you want to manually configure, or change anything not included in the setup
   * `subject` again is the subject of the email.
   * Because one will most likely use jellyfin-accounts behind a reverse proxy, it has no way of knowing the URL it will be accessed from. The email sent out includes a link to the invite page, so `url_base` stores the location of the invite path, e.g `https://jellyf.in:8056/invite`. 
 * **files**
-  * These can be left blank, unless you want anything stored outside of `~/.jf-accounts/`.
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+  * `custom_css` allows you to specify the path to custom CSS for bootstrap. For more info, see [Appearance](https://github.com/hrfee/jellyfin-accounts/wiki/Appearance).
+  * The rest can be left blank, unless you want anything stored outside of `~/.jf-accounts/` (a.k.a `/config` on docker).
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