The federal government Tuesday night released tens of thousands of pages on President John F. Kennedy’s assassination. It’s unclear how much light they’ll shed.

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The federal government on Tuesday night released tens of thousands of pages about the assassination of President John F. Kennedy, although it’s unclear how much light they will shed on one of the great turning points in American history.

The National Archives published the documents at the order of President Donald Trump, who on Monday told reporters at the Kennedy Center that officials would release “all of the Kennedy files” Tuesday. That sparked a “scramble” at the Justice Department, whose attorneys worked through the night, scouring hundreds of pages of documents, ABC News reported.

White House spokesman Harrison Fields, in a recent interview with NewsNation, promoted the upcoming records release, saying: “The American people will have their hands on these documents, and there will be a story to tell. I won’t preview you that story, but let me tell you: The American people are truly going to be shocked at what they see.”

Here are four things to know about the newly released documents on a watershed moment in United States history.