diff --git a/packages/SystemUI/aconfig/accessibility.aconfig b/packages/SystemUI/aconfig/accessibility.aconfig
index 8860452..5251246 100644
--- a/packages/SystemUI/aconfig/accessibility.aconfig
+++ b/packages/SystemUI/aconfig/accessibility.aconfig
@@ -4,6 +4,16 @@
 # NOTE: Keep alphabetized to help limit merge conflicts from multiple simultaneous editors.
 
 flag {
+    name: "add_black_background_for_window_magnifier"
+    namespace: "accessibility"
+    description: "Set the background for SurfaceView in window magnification black."
+    bug: "299981434"
+    metadata {
+      purpose: PURPOSE_BUGFIX
+    }
+}
+
+flag {
     name: "create_windowless_window_magnifier"
     namespace: "accessibility"
     description: "Uses SurfaceControlViewHost to create the magnifier for window magnification."