diff --git a/TODO b/TODO
index 0668995afad613344c9128cc5cddfab1037c2a72..0c739db9289159931f4b175c018bf483f1253696 100644
--- a/TODO
+++ b/TODO
@@ -25,6 +25,8 @@ Version 1.5.0:
 * Distributed clocks.
 * Bus simulator interface.
 * Implement ecrt_master_slave() in kernel space.
+* Rename phy-commands to register commands.
+* Timeout for sync manager config after clearing.
 
 Future issues:
 
diff --git a/master/fsm_slave_config.c b/master/fsm_slave_config.c
index 13070c61527ae37957bdb30e24f145ac4da52e23..b0bcb034c450d3df26dc3ee573a0174fc4cfefeb 100644
--- a/master/fsm_slave_config.c
+++ b/master/fsm_slave_config.c
@@ -458,6 +458,8 @@ void ec_fsm_slave_config_enter_mbox_sync(
 /*****************************************************************************/
 
 /** Slave configuration state: SYNC.
+ *
+ * \todo Timeout for response.
  */
 void ec_fsm_slave_config_state_mbox_sync(
         ec_fsm_slave_config_t *fsm /**< slave state machine */