diff --git a/src/datavisualization/engine/qabstract3dgraph.cpp b/src/datavisualization/engine/qabstract3dgraph.cpp
index 9fb71d59..df6ed597 100644
--- a/src/datavisualization/engine/qabstract3dgraph.cpp
+++ b/src/datavisualization/engine/qabstract3dgraph.cpp
@@ -743,6 +743,9 @@ qreal QAbstract3DGraph::horizontalAspectRatio() const
  * for custom items that intersect the floor plane. In that case, reflections should be turned off
  * to avoid incorrect rendering.
  *
+ * \note If using custom surface format, stencil buffer needs to be defined
+ * (QSurfaceFormat::setStencilBufferSize()) for reflections to work.
+ *
  * \sa reflectivity
  */
 void QAbstract3DGraph::setReflection(bool enable)