BLOOMINGTON, Ind. (AP) — Indiana University students are saving money by opting into a digital learning program that uses electronic textbooks.

The Indianapolis Star reports the program started in 2012 has saved students about $8 million. Anastasia Morrone, the university’s associate vice president for learning technologies, says electronic textbooks are being used this semester by about 25 percent of the more than 100,000 students in the Indiana University network.

The textbooks cost about $35, and students access them through the Internet on computers and mobile devices. They can take notes and highlight passages, and professors can also add their own notes.

Morrone says Indiana University has contracts with 21 publishers. She says the number of students using electronic textbooks has gone up each semester since the program started.