Former CIA director and Gen. David Petraeus in 2013 admitted to crossing out a classified designation on a document about a meeting he had with former Secretary of State Hillary Clinton, LawNewz.com reported Monday.

The startling admission was contained in little-noticed files released by the FBI late last month – a week before the agency made public its Clinton email investigation summary and interview notes, LawNewz reported.

The outlet reported a "curious note" on page 61 of a second Petraeus file, which pertains to Clinton, comes from a statement Petraeus made during a search of his house April 5, 2013, and it read:

"At approximately 12:17 p.m., PETRAEUS entered the office area [REDACTED] and stated in the presence of other search team personnel he was the originating authority of a document related to a meeting he had with Hillary Clinton, the former Secretary of State. This document contained a classification marking, which PETRAEUS had crossed by placing a line through it."

As head of the CIA, Petraeus had the authority to change the classification status of documents, "but doing so by crossing out the 'CLASSIFIED' marking is not standard procedure by any stretch," LawNewz's David Bixenspan wrote.

Petraeus entered a guilty plea in March 2015 to mishandling classified materials when he sent confidential documents to his biographer, who was also his mistress.