diff --git a/src/mame/drivers/saturn.c b/src/mame/drivers/saturn.c
index cd2eac80ec1..a8bd8b2726b 100644
--- a/src/mame/drivers/saturn.c
+++ b/src/mame/drivers/saturn.c
@@ -980,7 +980,7 @@ static ADDRESS_MAP_START( saturn_mem, AS_PROGRAM, 32 )
 	AM_RANGE(0x06000000, 0x060fffff) AM_RAM AM_MIRROR(0x01f00000) AM_SHARE("share3") AM_BASE_MEMBER(saturn_state,m_workram_h)
 	AM_RANGE(0x20000000, 0x2007ffff) AM_ROM AM_SHARE("share6")  // bios mirror
 	AM_RANGE(0x22000000, 0x24ffffff) AM_ROM AM_SHARE("share7")  // cart mirror
-	AM_RANGE(0xc0000000, 0xc00007ff) AM_RAM // cache RAM
+	AM_RANGE(0xc0000000, 0xc00007ff) AM_RAM // cache RAM, Dragon Ball Z sprites needs this
 ADDRESS_MAP_END
 
 static ADDRESS_MAP_START( stv_mem, AS_PROGRAM, 32 )
diff --git a/src/mame/machine/stvcd.c b/src/mame/machine/stvcd.c
index 26598da0998..181785f9918 100644
--- a/src/mame/machine/stvcd.c
+++ b/src/mame/machine/stvcd.c
@@ -658,6 +658,7 @@ static void cd_writeWord(running_machine &machine, UINT32 addr, UINT16 data)
 			hirqreg |= (CMOK);
 			break;
 
+		/* TODO: double check this */
 		case 0x0400:	// initialize CD system
 				// CR1 & 1 = reset software
 				// CR1 & 2 = decode RW subcode