diff --git a/Advanced-settings.md b/Advanced-settings.md
index 62378f2..1a2fc8c 100644
--- a/Advanced-settings.md
+++ b/Advanced-settings.md
@@ -360,7 +360,7 @@ If set to `true`, restores update behavior from before [1.22.3b ("Prevent uBO fr
 
 #### `filterAuthorMode`
 
-**Under development!!** Do not create related issues!
+Under development! Do not create related issues!
 
 Default: `false`.
 
@@ -523,6 +523,24 @@ For example, in the case of the [issue #1044](https://github.com/uBlockOrigin/uB
 
 ***
 
+#### `uiTheme`
+
+Default: `unset`.
+
+uBO [1.30.1b3](https://github.com/gorhill/uBlock/commit/e3a6d8465f19f4ef5d84ceddb9570644cf4fc0a3) and above.
+
+For development purposes only! DO NOT create issues about this feature!
+
+Allows to manually override dark mode theme status.
+
+Possible values:
+
+- `unset`: depending on uBO version - force light theme or uBO will pick the theme according to browser's `prefers-color-scheme`
+- `light`: force light theme
+- `dark`: force dark theme
+
+***
+
 #### `updateAssetBypassBrowserCache`
 
 Default: `false`