In the past, if a college basketball player declared for the draft, they had until 10 days after the draft combine to return to school. Say Maryland's Kevin Huerter, for example, didn't get drafted in the first two rounds - he'd be able to play for the Terps again.
One notable player that may have fallen under this rule this year had it been in place is Trevon Duval, who went undrafted when he declared for the NBA Draft after just one season at Duke.
Division I schools will be required to pay tuition, fees and books for basketball players who leave school and return to the same school to complete their degree. However, athletes can only officially visit a school once per year.
This new rule aims to help highly touted high school players "make informed decisions about going pro".
If coaches and staff are making any money off an outside company - like an "apparel company" - they will have to report that to their schools, too.
"The September 2017 announcement of a federal investigation into fraud in college basketball recruiting made it clear the NCAA needed to make significant changes - and do so quickly", the NCAA wrote on it's website.
University presidents and chancellors will be held "personally accountable" for any rule-breaking by their athletic departments.
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