InstrumentView: comment 'onInstrumentChangedByEditor'

GUI/View/Instrument/InstrumentView.cpp

@@ -168,6 +168,9 @@ void InstrumentView::onInstrumentdescriptionEdited(const QString& t)
 
 void InstrumentView::onInstrumentChangedByEditor()
 {
+    // uses 'MultiInstrumentNotifier::instrumentChanged' signal for two purposes:
+    // 1) notify 'ProjectDocument' that user has changed data ==> mark project with '*'
+    // 2) notify 'LinkInstrumentManager' ==> unlink instrument from data if they are incompatible
     m_document->multiNotifier()->notifyInstrumentChanged(
         m_instrumentListView->currentInstrumentItem());
 }