diff --git a/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh b/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh
index 216e7e4..097d9e0 100644
--- a/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh
+++ b/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-shutdown.sh
@@ -47,7 +47,7 @@
 
 test "$umount_proc" && umount /proc && rmdir /proc
 
-# ioctl(TIOC_DRAIN) to drain tty messages to console
+# tcsattr(tty, TIOCDRAIN, mode) to drain tty messages to console
 test -t 1 && stty cooked 0<&1
 
 # Execute the command systemd told us to ...