--- a/master/sync.c	Thu Sep 06 14:21:02 2012 +0200
+++ b/master/sync.c	Mon Nov 03 15:20:05 2014 +0100
@@ -161,6 +161,8 @@
 /*****************************************************************************/
 
 /** Determines the default direction from the control register.
+ *
+ * \return Direction.
  */
 ec_direction_t ec_sync_default_direction(
         const ec_sync_t *sync /**< EtherCAT sync manager. */