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diff --git a/examples/opengl/doc/src/hellogl2.qdoc b/examples/opengl/doc/src/hellogl2.qdoc
index 3a81b0dfad..29e8ef85cd 100644
--- a/examples/opengl/doc/src/hellogl2.qdoc
+++ b/examples/opengl/doc/src/hellogl2.qdoc
@@ -5,6 +5,7 @@
\example hellogl2
\title Hello GL2 Example
\ingroup examples-widgets-opengl
+ \examplecategory {3D}
\brief The Hello GL2 example demonstrates the basic use of the OpenGL-related classes
provided with Qt.