diff --git a/src/mame/drivers/galaxian.c b/src/mame/drivers/galaxian.c
index 57d56c4cdae..33a98369bd6 100644
--- a/src/mame/drivers/galaxian.c
+++ b/src/mame/drivers/galaxian.c
@@ -10457,7 +10457,7 @@ ROM_START( scobrab )
 	ROM_LOAD( "82s123.6e",    0x0000, 0x0020, CRC(9b87f90d) SHA1(d11ac5e4a6057301ea2a9cbb404c2b978eb4c1dc) )
 ROM_END
 
-ROM_START( scobrae )
+ROM_START( scobrae ) // main program is identical to the scobras set once decrypted
 	ROM_REGION( 0x10000, "maincpu", 0 ) // all roms have STERN labels
 	ROM_LOAD( "super cobra ra1 2c 1981.2c",   0x0000, 0x1000, CRC(ba9d4152) SHA1(f1792c0049804ac956ab7f95f699559fca4df960) )
 	ROM_LOAD( "super cobra ra1 2e 1981.2e",   0x1000, 0x1000, CRC(f9b77b27) SHA1(7974761456aaabcf016158ee5f5c32c89e43c748) )