How to add placeholder text to yii inputfield?

iam using clevertech an extension for YII, dose anybody know how i can add my own custom placeholder text inside the input. Below is an example of the input filed:

<?php echo $form->textFieldGroup(
            $model,
            'textField',
            array(
                'wrapperHtmlOptions' => array(
                    'class' => 'col-sm-5',
                ),
                'hint' => 'In addition to freeform text, any HTML5 text-based input appears like so.'
            )
        ); ?>

via Chebli Mohamed