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diff --git a/examples/statemachine/doc/src/trafficlight.qdoc b/examples/statemachine/doc/src/trafficlight.qdoc
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@@ -5,6 +5,7 @@
\example trafficlight
\title Traffic Light
\ingroup examples-qtstatemachine
+ \examplecategory {Data Processing & I/O}
\brief The Traffic Light example shows how to use \l{Qt State Machine Overview}
to implement the control flow of a traffic light.