Index: firmware/App/Controllers/BloodLeak.c
===================================================================
diff -u -rfae38745527912b9b64e618096556ae7ff263cb8 -r100c3f3ae29e9956c399dfec2479fcffc2a330ec
--- firmware/App/Controllers/BloodLeak.c	(.../BloodLeak.c)	(revision fae38745527912b9b64e618096556ae7ff263cb8)
+++ firmware/App/Controllers/BloodLeak.c	(.../BloodLeak.c)	(revision 100c3f3ae29e9956c399dfec2479fcffc2a330ec)
@@ -1852,6 +1852,14 @@
  *************************************************************************/
 static BOOL isLowerRangeIntensityDriftZeroingNeeded( void )
 {
+    /*
+     * Nominal intensity = 930
+     * Set point is queried from the blood leak detector
+     * Min drift from top = 930 - (setpoint * 40%)
+     * Max drift from top = 930 - (setpoint * 35%)
+     * If Min drift from top ≤ moving average intensity ≤ Max drift from top then the debounce timer is set
+     * If the debounce time has been elapsed the signal to zero the BLD is set
+     */
     BOOL status           = FALSE;
     BOOL isZeroingNeeded  = TRUE;
     U32 setPoint          = bloodLeakEmbModeCmd[ D_EMB_MODE_CMD ].commandResp;
@@ -1866,11 +1874,13 @@
 
     if ( FALSE == isZeroingNeeded )
     {
+        // Intensity drift is not in range so reset the debounce timer
         bloodLeakZeroingStatus.driftInRangeStartTimeMS = getMSTimerCount();
     }
 
     if ( ( TRUE == isZeroingAllowed ) && ( TRUE == didTimeout( bloodLeakZeroingStatus.driftInRangeStartTimeMS, BLD_ZERO_IN_RANGE_DRIFT_TIMEOUT_MS ) ) )
     {
+        // If the moving average intensity is set and then the debounce time has elapsed the signal to zero is set to true.
         status = TRUE;
     }