diff --git a/packages/docusaurus-1.x/examples/basics/siteConfig.js b/packages/docusaurus-1.x/examples/basics/siteConfig.js
index 7c628c9d69..9811d9a1f0 100644
--- a/packages/docusaurus-1.x/examples/basics/siteConfig.js
+++ b/packages/docusaurus-1.x/examples/basics/siteConfig.js
@@ -92,6 +92,10 @@ const siteConfig = {
   ogImage: 'img/undraw_online.svg',
   twitterImage: 'img/undraw_tweetstorm.svg',
 
+  // For sites with a sizable amount of content, set collapsible to true.
+  // Expand/collapse the links and subcategories under categories.
+  // docsSideNavCollapsible: true,
+
   // Show documentation's last contributor's name.
   // enableUpdateBy: true,