diff --git a/src/mame/video/taitoair.cpp b/src/mame/video/taitoair.cpp
index 37ec4ac5e1e..3449b002491 100644
--- a/src/mame/video/taitoair.cpp
+++ b/src/mame/video/taitoair.cpp
@@ -396,6 +396,7 @@ u32 taitoair_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, c
 {
 	m_tc0080vco->tilemap_update();
 
+	// TODO: Convert TC0430GRW to device (tc0280grd.cpp)
 	u32 counter1 = (m_tc0430grw[0] << 16) | m_tc0430grw[1];
 	u32 inc1x    = s16(m_tc0430grw[2]);
 	u32 inc1y    = s16(m_tc0430grw[3]);