--- a/master/fsm_slave.c	Tue Feb 12 15:30:34 2013 +0100
+++ b/master/fsm_slave.c	Tue Feb 12 15:46:43 2013 +0100
@@ -158,6 +158,8 @@
 /*****************************************************************************/
 
 /** Returns, if the FSM is currently not busy and ready to execute.
+ *
+ * \return Non-zero if ready.
  */
 int ec_fsm_slave_is_ready(
         const ec_fsm_slave_t *fsm /**< Slave state machine. */