Index: firmware/App/Modes/ModeFill.h
===================================================================
diff -u -rf267c42c91fd6e22db80e19039b8993582de51e9 -rf43eb1e9e0803776ec7420b16e1db8760b020bd9
--- firmware/App/Modes/ModeFill.h	(.../ModeFill.h)	(revision f267c42c91fd6e22db80e19039b8993582de51e9)
+++ firmware/App/Modes/ModeFill.h	(.../ModeFill.h)	(revision f43eb1e9e0803776ec7420b16e1db8760b020bd9)
@@ -1,4 +1,4 @@
-/**************************************************************************
+/**********************************************************************//**
  *
  *  Copyright (c) 2019-2020 Diality Inc. - All Rights Reserved.
  *
@@ -19,6 +19,15 @@
 
 #include "DGCommon.h"
 
+/**
+ *  @defgroup FillMode FillMode
+ *  @brief Fill mode module.
+ *  Manages fill mode functions via a state machine.
+ *
+ *  @addtogroup FillMode
+ *  @{
+ */
+
 // ********** public definitions **********
 
 // ********** private function prototypes **********
@@ -27,4 +36,6 @@
 void transitionToFillMode( void );  // prepares for transition to fill mode
 void execFillMode( void );          // execute the fill mode state machine (call from OperationModes)
 
+/**@}*/
+
 #endif