diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index d741f35d7b3a..14a102e877d6 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -275,6 +275,8 @@ int line_ioctl(struct tty_struct *tty, struct file * file,
 	case TIOCGLTC:
 	case TIOCSLTC:
 #endif
+	/* Note: these are out of date as we now have TCGETS2 etc but this
+	   whole lot should probably go away */
 	case TCGETS:
 	case TCSETSF:
 	case TCSETSW: