Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -rbe52d03bb19fb71b2f90ae4c134204aefb93da4c -rb15f0a054b8b0a315476ea5ea95869be5da00a59
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision be52d03bb19fb71b2f90ae4c134204aefb93da4c)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision b15f0a054b8b0a315476ea5ea95869be5da00a59)
@@ -66,6 +66,7 @@
 } BLOCKED_MSGS_DATA_T;
 #pragma pack(pop)
 
+/// Institutional record payload structure
 typedef struct
 {
     U32 minBloodFlowMLPM;                                   ///< Min blood flow in mL/min.
@@ -99,6 +100,7 @@
     U32 txEndBloodFlowMLPM;                                 ///< Treatment end blood flow in mL/min.
 } HD_INSTITUTIONAL_LOCAL_RECORD_T;
 
+/// Local serial number
 typedef struct
 {
     U08 topLevelSN[ MAX_TOP_LEVEL_SN_CHARS ];