diff --git a/proguard.flags b/proguard.flags
new file mode 100644
index 0000000..e52ac20
--- /dev/null
+++ b/proguard.flags
@@ -0,0 +1,4 @@
+-verbose
+
+# Keep @VisibleForTesting elements
+-keep @com.android.internal.annotations.VisibleForTesting class *