diff --git a/api/system-current.txt b/api/system-current.txt
index b731a3dfdd5a5..9537e57ec87aa 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -244,6 +244,7 @@ package android {
   }
 
   public static final class R.style {
+    field public static final int Theme_DeviceDefault_DocumentsUI = 16974562; // 0x10302e2
     field public static final int Theme_Leanback_FormWizard = 16974544; // 0x10302d0
   }
 
diff --git a/core/res/res/values/public.xml b/core/res/res/values/public.xml
index 777886a9911cb..4235341b626b0 100644
--- a/core/res/res/values/public.xml
+++ b/core/res/res/values/public.xml
@@ -2944,6 +2944,8 @@
     </public-group>
 
     <public-group type="style" first-id="0x010302e2">
+        <!-- @hide @SystemApi -->
+        <public name="Theme.DeviceDefault.DocumentsUI" />
     </public-group>
 
     <public-group type="id" first-id="0x01020046">
diff --git a/core/res/res/values/themes_device_defaults.xml b/core/res/res/values/themes_device_defaults.xml
index 75a727bdcfdf9..160350878349d 100644
--- a/core/res/res/values/themes_device_defaults.xml
+++ b/core/res/res/values/themes_device_defaults.xml
@@ -1711,4 +1711,6 @@ easier.
         <item name="notificationHeaderTextAppearance">@style/TextAppearance.DeviceDefault.Notification.Info</item>
     </style>
 
+    <!-- @hide DeviceDefault theme for the DocumentsUI app.  -->
+    <style name="Theme.DeviceDefault.DocumentsUI" parent="Theme.DeviceDefault.DayNight" />
 </resources>