diff --git a/core/res/res/layout/notification_template_header.xml b/core/res/res/layout/notification_template_header.xml
index d16dcc6b906ce..38ea92a73a5aa 100644
--- a/core/res/res/layout/notification_template_header.xml
+++ b/core/res/res/layout/notification_template_header.xml
@@ -96,6 +96,7 @@
         android:layout_height="wrap_content"
         android:paddingTop="1dp"
         android:visibility="gone"
+        android:contentDescription="@string/expand_button_content_description"
         />
     <ImageView android:id="@+id/profile_badge"
         android:layout_width="@dimen/notification_badge_size"
diff --git a/core/res/res/values/strings.xml b/core/res/res/values/strings.xml
index 22e5578b88a13..c99a88218e1a8 100644
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -4263,6 +4263,12 @@
     <!-- Content description of the work profile icon in the notification. -->
     <string name="notification_work_profile_content_description">Work profile</string>
 
+    <!-- Content description of the expand button icon in the notification.-->
+    <string name="expand_button_content_description">Expand button</string>
+
+    <!-- Accessibility action description on the expand button. -->
+    <string name="expand_action_accessibility">Click to expand</string>
+
     <!-- User visible name for USB MIDI Peripheral port -->
     <string name="usb_midi_peripheral_name">Android USB Peripheral Port</string>
     <!-- Manufacturer name for USB MIDI Peripheral port -->