diff --git a/src/waveform/widgets/allshader/waveformwidget.cpp b/src/waveform/widgets/allshader/waveformwidget.cpp
index f8b88ed927a..8c54b9f861a 100644
--- a/src/waveform/widgets/allshader/waveformwidget.cpp
+++ b/src/waveform/widgets/allshader/waveformwidget.cpp
@@ -95,6 +95,7 @@ WaveformWidget::WaveformWidget(QWidget* parent,
 WaveformWidget::~WaveformWidget() {
     makeCurrentIfNeeded();
     m_rendererStack.clear();
+    // destruction of nodes needs to happen within the opengl context
     m_pEngine.reset();
     doneCurrent();
 }