Twenty-first century literacy includes a mixture of digital and print literacy skills and strategies. AutoTutor for Adult Reading Comprehension is a web-based intelligent tutoring system that is designed to help adult learners develop effective reading comprehension strategies. Lessons span basic reading skills (vocabulary, word parts), comprehension of sentences and texts in different text genres and rhetorical structures, including digital documents and media. The AutoTutor system features an accessible interface, conversational trialogues with helpful and engaging computer agents, and material and scenarios that were developed specifically for adult learners. Studies suggest that this system significantly improves learning outcomes when used in conjunction with classroom instruction. Materials described in this article are free and readily available to adult educators and their students. [This article was published in "COABE Journal: The Resource for Adult Education."]