diff --git a/app/src/basic/res/xml/preferences.xml b/app/src/basic/res/xml/preferences.xml
index 23a59d063..3693bfb24 100644
--- a/app/src/basic/res/xml/preferences.xml
+++ b/app/src/basic/res/xml/preferences.xml
@@ -70,6 +70,11 @@
                 android:defaultValue="@string/defaultTheme"
                 android:entries="@array/themeNames"
                 android:entryValues="@array/themeValues"/>
+        <SwitchPreferenceCompat
+            android:defaultValue="false"
+            android:key="usePureBlackDarkTheme"
+            android:summary="@string/use_pure_black_dark_theme_summary"
+            android:title="@string/use_pure_black_dark_theme" />
     </PreferenceCategory>
 
     <PreferenceCategory android:title="@string/appcompatibility"
diff --git a/app/src/main/res/xml/preferences.xml b/app/src/main/res/xml/preferences.xml
index 5707821b8..aa2fd86af 100644
--- a/app/src/main/res/xml/preferences.xml
+++ b/app/src/main/res/xml/preferences.xml
@@ -1,5 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <!--
+    IMPORTANT: If you change anything here, also check if the same change needs to be made in
+               for the basic flavor: basic/res/xml/preferences.xml
+    -->
 
     <PreferenceScreen
         android:key="pref_about"