QCommandLineParser without valueName warning msg not good

My code contains problem and I get warning message, but this message is not clear. I suggest to change warning message to make it more user-friendly.

QCommandLineParser parser;
QCommandLineOption NumOption(QStringList() << "n" << "num", "help text");
parser.addOption(NumOption);
const QString numStr= parser.value(NumOption); //warning 'option not expecting values' here

To start app I use

./app --num 123
QCommandLineParser: option not expecting values: "num"

Solution on forum. But I suggest to change warning message from QCommandLineParser: option not expecting values: "num" to, for example, QCommandLineParser: you should also set valueName for: "num"