diff --git a/src/mess/machine/sns_sgb.c b/src/mess/machine/sns_sgb.c
index 8940689d531..dac40ccc6a4 100644
--- a/src/mess/machine/sns_sgb.c
+++ b/src/mess/machine/sns_sgb.c
@@ -5,7 +5,10 @@
  Copyright MESS Team.
  Visit http://mamedev.org for licensing and usage restrictions.
 
- TODO: almost everything
+ TODO: almost everything, e.g.
+ * implement gb_timer_callback
+ * gb_io_r/w
+ * add hook-up to copy LCD scanline to m_lcd_buffer
 
  ***********************************************************************************************************/