diff --git a/navigation.mdx b/navigation.mdx
index 44968d452..c8e9fe3f4 100644
--- a/navigation.mdx
+++ b/navigation.mdx
@@ -57,7 +57,7 @@ Use groups to organize your sidebar navigation into sections. Groups can be nest
   alt=""
 />
 
-In the `navigation` object, `groups` is an array where each entry is an object that requires a `group` field and a `pages` field. The `icon` and `tag` fields are optional.
+In the `navigation` object, `groups` is an array where each entry is an object that requires a `group` field and a `pages` field. The `icon`, `tag`, and `expanded` fields are optional.
 
 ```json
 {
@@ -66,6 +66,7 @@ In the `navigation` object, `groups` is an array where each entry is an object t
       {
         "group": "Getting started",
         "icon": "play",
+        "expanded": false,
         "pages": [
           "quickstart",
           {
@@ -92,6 +93,18 @@ In the `navigation` object, `groups` is an array where each entry is an object t
 }
 ```
 
+### Default expanded state
+
+Set `expanded: true` on a group to make it expanded by default in the navigation sidebar. This is useful for highlighting important sections or improving discoverability of key content.
+
+```json
+{
+  "group": "Getting started",
+  "expanded": true,
+  "pages": ["quickstart", "installation"]
+}
+```
+
 ## Tabs
 
 Tabs create distinct sections of your documentation with separate URL paths. Tabs create a horizontal navigation bar at the top of your documentation that lets users switch between sections.