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diff --git a/examples/quick/particles/system/timedgroupchanges.qml b/examples/quick/particles/system/timedgroupchanges.qml
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+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick
+import QtQuick.Particles
+
+Rectangle {
+    width: 360
+    height: 600
+    color: "black"
+    ParticleSystem {
+        anchors.fill: parent
+        id: syssy
+        //! [0]
+        ParticleGroup {
+            name: "fire"
+            duration: 2000
+            durationVariation: 2000
+            to: {"splode":1}
+        }
+        //! [0]
+        //! [1]
+        ParticleGroup {
+            name: "splode"
+            duration: 400
+            to: {"dead":1}
+            TrailEmitter {
+                group: "works"
+                emitRatePerParticle: 100
+                lifeSpan: 1000
+                maximumEmitted: 1200
+                size: 8
+                velocity: AngleDirection {angle: 270; angleVariation: 45; magnitude: 20; magnitudeVariation: 20;}
+                acceleration: PointDirection {y:100; yVariation: 20}
+            }
+        }
+        //! [1]
+        //! [2]
+        ParticleGroup {
+            name: "dead"
+            duration: 1000
+            Affector {
+                once: true
+                onAffected: (x, y)=> worksEmitter.burst(400,x,y)
+            }
+        }
+        //! [2]
+
+        Timer {
+            interval: 6000
+            running: true
+            triggeredOnStart: true
+            repeat: true
+            onTriggered:startingEmitter.pulse(100);
+        }
+        Emitter {
+            id: startingEmitter
+            group: "fire"
+            width: parent.width
+            y: parent.height
+            enabled: false
+            emitRate: 80
+            lifeSpan: 6000
+            velocity: PointDirection {y:-100;}
+            size: 32
+        }
+
+        Emitter {
+            id: worksEmitter
+            group: "works"
+            enabled: false
+            emitRate: 100
+            lifeSpan: 1600
+            maximumEmitted: 6400
+            size: 8
+            velocity: CumulativeDirection {
+                PointDirection {y:-100}
+                AngleDirection {angleVariation: 360; magnitudeVariation: 80;}
+            }
+            acceleration: PointDirection {y:100; yVariation: 20}
+        }
+
+        ImageParticle {
+            groups: ["works", "fire", "splode"]
+            source: "qrc:///particleresources/glowdot.png"
+            entryEffect: ImageParticle.Scale
+        }
+    }
+}
+