diff --git a/admin/tool/mobile/classes/api.php b/admin/tool/mobile/classes/api.php
index a60b8f6b95c..c52ad256c5f 100644
--- a/admin/tool/mobile/classes/api.php
+++ b/admin/tool/mobile/classes/api.php
@@ -421,6 +421,7 @@ class api {
                 'NoDelegate_CoreTag' => new lang_string('tags'),
                 '$mmLoginEmailSignup' => new lang_string('startsignup'),
                 'NoDelegate_ResponsiveMainMenuItems' => new lang_string('responsivemainmenuitems', 'tool_mobile'),
+                'NoDelegate_DarkMode' => new lang_string('darkmode', 'tool_mobile'),
             ),
             "$mainmenu" => array(
                 '$mmSideMenuDelegate_mmaFrontpage' => new lang_string('sitehome'),
diff --git a/admin/tool/mobile/lang/en/tool_mobile.php b/admin/tool/mobile/lang/en/tool_mobile.php
index e9d2fd81d0a..15a115d5830 100644
--- a/admin/tool/mobile/lang/en/tool_mobile.php
+++ b/admin/tool/mobile/lang/en/tool_mobile.php
@@ -51,6 +51,7 @@ App help|https://someurl.xyz/help|inappbrowser
 My grades|https://someurl.xyz/local/mygrades/index.php|embedded|en
 Mis calificaciones|https://someurl.xyz/local/mygrades/index.php|embedded|es
 </pre>';
+$string['darkmode'] = 'Dark mode';
 $string['disabledfeatures'] = 'Disabled features';
 $string['disabledfeatures_desc'] = 'Select here the features you want to disable in the Mobile app for your site. Please note that some features listed here could be already disabled via other site settings. You will have to log out and log in again in the app to see the changes.';
 $string['displayerrorswarning'] = 'Display debug messages (debugdisplay) is enabled. It should be disabled.';