ProjectDocument: add comment

GUI/View/Project/ProjectManager.cpp

@@ -373,6 +373,7 @@ ProjectDocument::ReadResult ProjectManager::loadProject(const QString& projectFi
         readResult =
             gSessionData->projectDocument.value()->loadProjectFile(autosaveName, messageService);
         gSessionData->projectDocument.value()->setProjectFileName(projectFileName);
+        // restored project should be marked by '*'
         gSessionData->projectDocument.value()->setModified();
     } else {
         QApplication::setOverrideCursor(Qt::WaitCursor);