diff --git a/Sources/VLSheetViewInternal.h b/Sources/VLSheetViewInternal.h
index 863c177..11b9a90 100644
--- a/Sources/VLSheetViewInternal.h
+++ b/Sources/VLSheetViewInternal.h
@@ -20,6 +20,10 @@ const float kKeyW		= 10.0f;
 const float kAccW		= 10.0f;
 const float kSharpY		=-15.0f;
 const float kFlatY		= -7.0f;
+const float kNaturalY	=-15.0f;
+const float kSharpW		=-11.0f;
+const float kFlatW		= -9.0f;
+const float kNaturalW	= -7.0f;
 const float kImgScale	= 0.04f;
 const float kChordY		=  7.0f*kLineH;
 const float kChordW		= 40.0f;