A new PBS documentary about the nation’s historically black colleges and universities might just provide the best argument for a multihour, Ken Burns-type epic exploration of the subject.

Tell Them We Are Rising: The Story of Black Colleges and Universities will air as part of PBS’s Independent Lens series on Feb. 19. Directed by Stanley Nelson (The Black Panthers: Vanguard of the Revolution), Tell Them We Are Rising goes broad but not particularly deep as it attempts to recount the history of black higher education from slavery to the present day in an hour and 25 minutes.

It’s a useful primer for those who might not be familiar with historically black colleges and universities (HBCUs) or their purpose, but Tell Them leaves much on the table when it comes to specifics. The documentary arrives at a time when the future of many HBCUs is uncertain as schools face the compounding weight of decades of financial strain, growing competition for students and pressure to keep tuition costs down.

Tell Them is at its best when delving into the birth of the institutions, many of which were established with the help of government land grants after the Civil War. Nelson outlines the philosophical differences between W.E.B. Du Bois and Booker T. Washington and briefly touches on the fact that in their infancies, many HBCUs were run by white presidents. While Nelson outlines the story of Fayette McKenzie, the Fisk University president who tried to ban any sort of social interaction between the sexes in 1924, he neglects to follow the legacy of McKenzie’s thinking, which shows up in the visitation policies on many a modern HBCU campus.

There are so many valuable, urgent story lines worth mining, and Tell Them simply doesn’t have the time to do them justice. The tradition of activism on HBCU campuses, which resulted in the creation of African-American studies programs and the de-Anglicization of many HCBU liberal arts programs also resulted in a deadly crackdown at Southern University. There’s the role fraternities and sororities such as Delta Sigma Theta, Alpha Kappa Alpha and Omega Psi Phi played in creating influential networks of black professionals. The legacy of protest hasn’t evaporated from modern HBCU campuses, but Tell Them falters in connecting past narratives to the present, whether it’s Howard University students protesting the George W. Bush administration or students nationwide criticizing their administrators for meeting with President Donald Trump. So much is curiously absent from the film, such as an exploration of the role Morehouse College played in shaping Martin Luther King Jr. and his contemporaries in the civil rights movement. Mary McCleod Bethune, the founder of what’s now Bethune-Cookman University and one of the chief architects of black higher education, is an afterthought.

It’s a useful primer for those who might not be familiar with HBCUs or their purpose, but Tell Them leaves much on the table when it comes to specifics.

Tell Them functions as an outline for what ought to be a deep-dive serialized documentary. Such a format would offer more opportunity to address questions such as what to make of the controversial legacy of the nation’s first black president when it comes to federal treatment of HBCUs. What challenges do they face from a current presidential administration that so far only seemed interested in convening the presidents of those institutions at the White House to use them as props? What are the modern issues students are facing at HBCUs, whether it’s the fight for queer visibility or addressing a national dilemma of campus sexual assault that presents unique challenges for HBCUs and their students?

Still, it’s understandable why we haven’t seen a splurge on such a subject. It’s expensive and time-consuming, and there are only a couple of networks (TV One and BET come to mind) that might be interested in the sort of exhaustive research I’m suggesting, and even then it’s a stretch. Maybe Netflix, with its seemingly endless pool of programming funds, would be willing. Maaaaaaybe.

Tell Them We Are Rising introduces the idea that HBCUs are under threat, and it certainly seems to support the idea of their continued existence. But aside from a broad history lesson, it stops short of offering much else.