diff --git a/res/values/strings.xml b/res/values/strings.xml
index 3eca599..5109b4f 100755
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -233,6 +233,8 @@
     <!-- The title of mode section view. [CHAR_LIMIT=20] -->
     <string name="mode_title" msgid="1000319159005403986">Dark theme</string>
     <string name="mode_disabled_msg" msgid="1926077857799715086">Temporarily disabled due to Battery Saver</string>
+    <!-- The text for A11y announcement when theme changes. -->
+    <string name="mode_changed">Theme changed</string>
 
     <!-- Title of a section of the customization where the user can select color override for icon. [CHAR LIMIT=30] -->
     <string name="themed_icon_title" msgid="4305612684940220645">Themed icons</string>
diff --git a/src/com/android/customization/model/mode/DarkModeSectionController.java b/src/com/android/customization/model/mode/DarkModeSectionController.java
index 382162e..f56b709 100644
--- a/src/com/android/customization/model/mode/DarkModeSectionController.java
+++ b/src/com/android/customization/model/mode/DarkModeSectionController.java
@@ -128,7 +128,11 @@
         UiModeManager uiModeManager = context.getSystemService(UiModeManager.class);
         int shortDelay = context.getResources().getInteger(android.R.integer.config_shortAnimTime);
         new Handler(Looper.getMainLooper()).postDelayed(
-                () -> uiModeManager.setNightModeActivated(viewActivated),
+                () -> {
+                    mDarkModeSectionView.announceForAccessibility(
+                            context.getString(R.string.mode_changed));
+                    uiModeManager.setNightModeActivated(viewActivated);
+                },
                 /* delayMillis= */ shortDelay);
     }