diff --git a/Sourcecode/include/mx/api/NoteData.h b/Sourcecode/include/mx/api/NoteData.h
index 9aa8a0f58..1c1539b02 100755
--- a/Sourcecode/include/mx/api/NoteData.h
+++ b/Sourcecode/include/mx/api/NoteData.h
@@ -101,9 +101,14 @@ namespace mx
             PitchData pitchData;          // step, alter, octave, accidental, etc
             int userRequestedVoiceNumber;
             Stem stem;
-            
-            // the location of the note, timewise, within the measure
-            // denominated in ticksPerQuarter as defined by ScoreData
+                        
+            // the time location of the note, within the measure, denominated in ticksPerQuarter which
+            // is defined in ScoreData. in each measure, the note with tickTimePosition 0 is located at
+            // the start of the measure. if ScoreData defines ticksPerQuarter as N, then the note
+            // located at tickTimePosition N will be located one quarter note after the start of the
+            // measure. MusicXML's <forward> and <backup> tags will be automatically placed into the
+            // MusicXML as required to facilitate the correct timing of notes based on their 
+            // tickTimePosition values.
             int tickTimePosition;
             DurationData durationData;