From 06ab4c34a8158b1a924f03a14aa57173c6f77078 Mon Sep 17 00:00:00 2001
From: Florian Pose <fp@igh.de>
Date: Thu, 12 Oct 2017 13:09:52 +0200
Subject: [PATCH] Doc.

---
 master/device.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/master/device.c b/master/device.c
index e9aca4c9..deb938fa 100644
--- a/master/device.c
+++ b/master/device.c
@@ -629,6 +629,8 @@ void ecdev_close(ec_device_t *device /**< EtherCAT device */)
  * Forwards the received data to the master. The master will analyze the frame
  * and dispatch the received commands to the sending instances.
  *
+ * The data have to begin with the Ethernet header (target MAC address).
+ *
  * \ingroup DeviceInterface
  */
 void ecdev_receive(