Index: HDDefs.h
===================================================================
diff -u -r18a4501e28709427bb8c6c53759d35e2536a4c42 -r72f1464a951c958435b8eed60a19150610e45421
--- HDDefs.h	(.../HDDefs.h)	(revision 18a4501e28709427bb8c6c53759d35e2536a4c42)
+++ HDDefs.h	(.../HDDefs.h)	(revision 72f1464a951c958435b8eed60a19150610e45421)
@@ -751,6 +751,7 @@
     HD_EVENT_RSRVR_1_LOAD_CELL_END_VALUES,                              ///< HD reservoir 2 load cells end values
     HD_EVENT_RSRVR_2_LOAD_CELL_START_VALUES,                            ///< HD reservoir 2 load cells start values
     HD_EVENT_RSRVR_2_LOAD_CELL_END_VALUES,                              ///< HD reservoir 2 load cells end values
+    HD_EVENT_SUB_STATE_CHANGE,                                          ///< HD Op sub-state change event
     NUM_OF_EVENT_IDS                                                    ///< Total number of HD events
 };
 typedef enum HD_Event_List HD_EVENT_ID_T;                               ///< Type for HD event list enumeration