diff --git a/README.md b/README.md
index a7290e642df..914e2455f85 100644
--- a/README.md
+++ b/README.md
@@ -103,7 +103,7 @@ It's also available for a reversed layout when you add both classes:
 Show an open sidebar on page load by modifying the `<input>` to add the `checked` boolean attribute:
 
 ```html
-<input type="checkbox" class="sidebar-checkbox" id="sidebar-checkbox">
+<input type="checkbox" class="sidebar-checkbox" id="sidebar-checkbox" checked>
 ```
 
 Using Liquid you can also conditionally show the sidebar open on a per-page basis. For example, here's how you could have it open on the homepage only: