Mindfulness when “reading” : Ven . Mahasi Sayadaw tradition

Practice Ven . Mahasi Sayadaw tradition --------------------------------------- I spend most of my unproductive time (traveling , when nothing special to do ) on reading Dhamma books using my iPhone. These moments are not appropriate for sitting or walking meditation , so I follow "daily life" instructions can be found here http://www.sirimangalo.org/teachings/how-to-meditate/chapter-six-daily-life **But when I try to make a clear thought "reading" while reading I find it interfere with reading . How should I use clear thoughts to be mindful when reading ?**