--- a/master/fsm_pdo_entry.c	Tue Feb 12 15:30:34 2013 +0100
+++ b/master/fsm_pdo_entry.c	Tue Feb 12 15:46:43 2013 +0100
@@ -363,6 +363,8 @@
 /*****************************************************************************/
 
 /** Process next PDO entry.
+ *
+ * \return Next PDO entry, or NULL.
  */
 ec_pdo_entry_t *ec_fsm_pdo_entry_conf_next_entry(
         const ec_fsm_pdo_entry_t *fsm, /**< PDO mapping state machine. */