Return to Paragraph

[Unbdld]

Hi, newbie here, does anyone know how I can come back to a specific paragraph where I left off of an article/document? I'm a student and many times i'm reading long documents like 30pages long and need to take a break and come back the next day. Is there a way I can somehow flag where i left off reading so that I can find it easily instead of writing on a scratchpad(go to page 17 half way down and look for a pencil mark).....

Thank you!