From f0ac13e3e29d9f28718726e73e30396ccb9e3c9b Mon Sep 17 00:00:00 2001
From: Flying-Toast <38232168+Flying-Toast@users.noreply.github.com>
Date: Thu, 26 Sep 2019 12:09:30 -0400
Subject: [PATCH] Document preferred-dark-theme config option

---
 book-example/src/format/config.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/book-example/src/format/config.md b/book-example/src/format/config.md
index d443911f..5d40d910 100644
--- a/book-example/src/format/config.md
+++ b/book-example/src/format/config.md
@@ -150,6 +150,8 @@ The following configuration options are available:
   files with the ones found in the specified folder.
 - **default-theme:** The theme color scheme to select by default in the
   'Change Theme' dropdown. Defaults to `light`.
+- **preferred-dark-theme:** The default theme to use if the browser
+  requests the dark version of the site. Defaults to `navy`.
 - **curly-quotes:** Convert straight quotes to curly quotes, except for those
   that occur in code blocks and code spans. Defaults to `false`.
 - **mathjax-support:** Adds support for [MathJax](mathjax.md). Defaults to