diff --git a/man4/tty_ioctl.4 b/man4/tty_ioctl.4
index 6d0c4c869..e54be3cdb 100644
--- a/man4/tty_ioctl.4
+++ b/man4/tty_ioctl.4
@@ -299,6 +299,14 @@ except for a process with the
 .BR CAP_SYS_ADMIN
 capability.)
 .TP
+.BI "TIOCGEXCL	int *" argp
+If the terminal is currently in exclusive mode,
+place a nonzero value in the location pointed to by
+.IR argp ;
+otherwise, place zero in
+.IR *argp
+(since Linux 3.8).
+.TP
 .B "TIOCNXCL	void"
 Disable exclusive mode.
 .SS Line discipline