diff --git a/car-usb-handler/proguard.flags b/car-usb-handler/proguard.flags
new file mode 100644
index 0000000..565df26
--- /dev/null
+++ b/car-usb-handler/proguard.flags
@@ -0,0 +1,2 @@
+-verbose
+-keep @com.android.internal.annotations.VisibleForTesting class *