diff --git a/man4/tty_ioctl.4 b/man4/tty_ioctl.4
index d829928e2..c8dc00f58 100644
--- a/man4/tty_ioctl.4
+++ b/man4/tty_ioctl.4
@@ -216,11 +216,15 @@ or
 .I /dev/tty0
 to the given tty.
 If that was a pty master, send it to the slave.
-Anybody can do this as long as the output was not redirected yet.
-If it was redirected already
+In Linux before version 2.6.10,
+anybody can do this as long as the output was not redirected yet;
+since version 2.6.10, only root (a process with the
+.BR CAP_SYS_ADMIN
+capability) may do this.
+If output was redirected already
 .B EBUSY
 is returned,
-but root may stop redirection by using this ioctl with
+but redirection can be stopped by using this ioctl with
 .I fd
 pointing at
 .I /dev/console