Component is missing required property index from here

Warning: /var/tmp/test.qml:6:9: Component is missing required property index from here
        Text {
        ^^^^

import QtQuick 2.0

Row {
    Repeater {
        model: 3
        Text {
            required property int index
            height: 40
            color: "black"
            text: "I'm item " + index 
        }
    }
}