1 files changed, 3 insertions, 1 deletions
diff --git a/src/sprite.h b/src/sprite.h
index 13d0383..6538c1d 100644
--- a/src/sprite.h
+++ b/src/sprite.h

@@ -11,8 +11,10 @@
 #include "step_type.h"
 enum class SpriteLayer {
+  Mask,
  Normal,
-  Above
+  Above,
+  NUM_SPRITE_LAYERS // do not use
 };
 struct SpriteFrame {