diff --git a/docs/configuration.md b/docs/configuration.md
index d39c8b5..1eea49d 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -308,6 +308,7 @@ pages:
 | slug | string | no | |
 | width | string | no | |
 | hide-desktop-navigation | boolean | no | false |
+| expand-mobile-page-navigation | boolean | no | false |
 | show-mobile-header | boolean | no | false |
 | columns | array | yes | |
 
@@ -332,6 +333,9 @@ The maximum width of the page on desktop. Possible values are `slim` and `wide`.
 #### `hide-desktop-navigation`
 Whether to show the navigation links at the top of the page on desktop.
 
+#### `expand-mobile-page-navigation`
+Whether the mobile page navigation should be expanded by default.
+
 #### `show-mobile-header`
 Whether to show a header displaying the name of the page on mobile. The header purposefully has a lot of vertical whitespace in order to push the content down and make it easier to reach on tall devices.