diff --git a/man3/byteorder.3 b/man3/byteorder.3
index 0781fd520..930755a96 100644
--- a/man3/byteorder.3
+++ b/man3/byteorder.3
@@ -29,7 +29,7 @@
 .\" Modified Sat Jul 24 21:29:05 1993 by Rik Faith (faith@cs.unc.edu)
 .\" Modified Thu Jul 26 14:06:20 2001 by Andries Brouwer (aeb@cwi.nl)
 .\"
-.TH BYTEORDER 3  2009-01-15 "GNU" "Linux Programmer's Manual"
+.TH BYTEORDER 3  2014-04-08 "GNU" "Linux Programmer's Manual"
 .SH NAME
 htonl, htons, ntohl, ntohs \- convert values between host and network
 byte order
@@ -73,6 +73,15 @@ from network byte order to host byte order.
 On the i386 the host byte order is Least Significant Byte first,
 whereas the network byte order, as used on the Internet, is Most
 Significant Byte first.
+.SH ATTRIBUTES
+.SS Multithreading (see pthreads(7))
+The
+.BR htonl (),
+.BR htons (),
+.BR ntohl (),
+and
+.BR ntohs ()
+functions are thread-safe.
 .SH CONFORMING TO
 POSIX.1-2001.