diff --git a/man2/ioctl_tty.2 b/man2/ioctl_tty.2
index 9854cfd3f..1d9a6dee1 100644
--- a/man2/ioctl_tty.2
+++ b/man2/ioctl_tty.2
@@ -71,7 +71,10 @@ Equivalent to
 Allow the output buffer to drain, discard pending input, and
 set the current serial port settings.
 .PP
-The following four ioctls are just like
+The following four ioctls, added in Linux 2.6.20,
+.\" commit 64bb6c5e1ddcd47c951740485026ef08975ee2e6
+.\" commit 592ee3a5e5e2a981ef2829a0380093006d045661
+are just like
 .BR TCGETS ,
 .BR TCSETS ,
 .BR TCSETSW ,