diff --git a/index.html b/index.html
index 44e5fb6..58ea2ce 100644
--- a/index.html
+++ b/index.html
@@ -2,6 +2,7 @@
 <html lang="en">
   <head>
     <meta charset="utf-8" />
+    <meta name="color-scheme" content="light dark" />
     <title>Web of Things (WoT) Scripting API</title>
     <script src='https://www.w3.org/Tools/respec/respec-w3c' class='remove' defer></script>
     <script class='remove'>
