EchoPlugin documentation documents Q_INTERFACES wrongly

http://doc.qt.nokia.com/latest/tools-echoplugin.html says in section "EchoPlugin Class Definition":
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The Q_INTERFACES macro tells Qt which interfaces the class implements. In our case we only implement the EchoInterface. If a class implements more than one interface, they are given as a comma separated list.
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However the example given in http://doc.qt.nokia.com/4.6/qobject.html#Q_INTERFACES suggests that the list is NOT comma separated, but space separated. In fact providing a comma separated list will result in a parse error in moc, with no further indication that a space separated list is required.

Suggestion: Fix echoplugin docs, specify space separation in Q_INTERFACES docs, add unexpected characters to diagnostic output of moc.