From f41d7fb3de1835b523e2f48a44bde76f28599974 Mon Sep 17 00:00:00 2001
From: Rasmus Villemoes <rv@rasmusvillemoes.dk>
Date: Wed, 4 Jun 2014 18:33:28 +0200
Subject: [PATCH] sendmmsg.2: Add reference to feature_test_macros(7)

Signed-off-by: Rasmus Villemoes <rv@rasmusvillemoes.dk>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
---
 man2/sendmmsg.2 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/man2/sendmmsg.2 b/man2/sendmmsg.2
index 97c7ede2d..f9871396c 100644
--- a/man2/sendmmsg.2
+++ b/man2/sendmmsg.2
@@ -30,7 +30,7 @@
 sendmmsg \- send multiple messages on a socket
 .SH SYNOPSIS
 .nf
-.B "#define _GNU_SOURCE"
+.B "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
 .BI "#include <sys/socket.h>"
 
 .BI "int sendmmsg(int " sockfd ", struct mmsghdr *" msgvec \