diff --git a/core/api/test-current.txt b/core/api/test-current.txt
index c2f960f85c73..79c4fb653542 100644
--- a/core/api/test-current.txt
+++ b/core/api/test-current.txt
@@ -3633,6 +3633,7 @@ package android.view {
 
   public static final class Display.Mode implements android.os.Parcelable {
     ctor public Display.Mode(int, int, float);
+    method public boolean isSynthetic();
     method public boolean matches(int, int, float);
   }
 
diff --git a/core/java/android/view/Display.java b/core/java/android/view/Display.java
index 15b0c13de524..1f7ed8be357c 100644
--- a/core/java/android/view/Display.java
+++ b/core/java/android/view/Display.java
@@ -2344,6 +2344,8 @@ public float getVsyncRate() {
          * SurfaceControl.DisplayMode
          * @hide
          */
+        @SuppressWarnings("UnflaggedApi") // For testing only
+        @TestApi
         public boolean isSynthetic() {
             return mIsSynthetic;
         }