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diff --git a/examples/opengl/doc/src/2dpainting.qdoc b/examples/opengl/doc/src/2dpainting.qdoc
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--- a/examples/opengl/doc/src/2dpainting.qdoc
+++ b/examples/opengl/doc/src/2dpainting.qdoc
@@ -28,6 +28,7 @@
/*!
\example 2dpainting
\title 2D Painting Example
+ \ingroup examples-widgets-opengl
\brief The 2D Painting example shows how QPainter and QGLWidget can be used
together to display accelerated 2D graphics on supported hardware.