Bookmarking so a learner can start where they left off

dianeh Community Member Posts: 1
I am creating a very large course and most users will not have time to complete it in one sitting. I publish to HTML so do not have a book marking option which will allow the learner to start again where they left. Does anyone have any ideas on how to create a book mark in Lectora so the learner will have the option to start where they left off?