Index: MsgDefs.h
===================================================================
diff -u -r468c458dfd28a5770ae0d0519118e0d9b9a74cce -r464ac01aef9dafa072092627a7cc383aa1f35485
--- MsgDefs.h	(.../MsgDefs.h)	(revision 468c458dfd28a5770ae0d0519118e0d9b9a74cce)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision 464ac01aef9dafa072092627a7cc383aa1f35485)
@@ -46,8 +46,10 @@
     MSG_ID_USER_CONFIRM_UF_SETTINGS_CHANGE = 0x15,                      ///< User confirmation of ultrafiltration settings change.
     MSG_ID_USER_TREATMENT_TIME_CHANGE_REQUEST = 0x16,                   ///< User request to change treatment duration.
     MSG_ID_USER_BLOOD_DIAL_RATE_CHANGE_REQUEST = 0x17,                  ///< User request to change blood and dialysate rates.
-    MSG_ID_USER_BLOOD_DIAL_RATE_CHANGE_RESPONSE = 0x18,                 ///< HD response to user to change blood and dialysate rates.
+    MSG_ID_USER_BLOOD_DIAL_RATE_CHANGE_RESPONSE = 0x18,                 ///< HD response to user request to change blood and dialysate rates.
     MSG_ID_SET_DG_DIALYSATE_TEMP_TARGETS = 0x19,                        ///< HD provides DG with dialysate temperature set points.
+    MSG_ID_TREATMENT_PARAM_CHANGE_RANGES = 0x1A,                        ///< HD provides several parameter change ranges as they evolve over treatment duration
+    MSG_ID_USER_TREATMENT_TIME_CHANGE_RESPONSE = 0x1B,                  ///< HD response to user request to change treatment duration.
 
     // service/test CAN messages
 
@@ -97,7 +99,6 @@
     MSG_ID_DG_WATCHDOG_TASK_CHECKIN_OVERRIDE = 0xA002,
     MSG_ID_DG_SET_RTC_DATE_TIME = 0xA004,
     MSG_ID_LOAD_CELL_OVERRIDE = 0xA005,
-
     END_OF_MSG_IDS                                                      ///< # of system message IDs.
 } MSG_ID_T;