Index: MessagePayloads.h
===================================================================
diff -u -rbabcf7e639e5aa9a06a6aae5d3bda45e7034de2e -r16e4c027d8abb21f0992519c28aa0007d0556746
--- MessagePayloads.h	(.../MessagePayloads.h)	(revision babcf7e639e5aa9a06a6aae5d3bda45e7034de2e)
+++ MessagePayloads.h	(.../MessagePayloads.h)	(revision 16e4c027d8abb21f0992519c28aa0007d0556746)
@@ -46,6 +46,7 @@
     F32  bicarbConvFactor;                              ///< Conversion factor of bicarbonate.
     U32  sodium;                                        ///< Set sodium being used to make dialysate.
     U32  bicarbonate;                                   ///< Set bicarbonate being used to make dialysate.
+    F32  substitutionRate;                              ///< Set HDF rate (mL/min).
 } DIALYSATE_DELIVERY_REQ_PAYLOAD_T;
 
 /// Payload record structure for requesting pre generate dialysate.