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The note urges Biden's staff to take time off around Thanksgiving almost exactly six years ago, and to enjoy their time away from work making sure that they didn't miss out on any precious family moments.
It was originally shared on Twitter by Dan Barker, who pointed out that it could be because of Biden's own personal experiences that he encouraged staff to take time away from the office for more important matters.
Biden's son Beau died from cancer five years ago, and he also lost his first wife and young daughter Naomi in a car crash back in 1972.
Sharing the photo, Barker wrote: "By coincidence: exactly 6 years ago today, as Vice President of the USA, Joe Biden sent this note to his staff.
"I presume in the background, thoughts of his first wife & daughter who died long ago; or his son, who died of cancer just a few months after this note. Worth reading."
The letter reads: "To my Wonderful Staff.
"I would like to take a moment and make something clear to everyone.
"I do not expect nor do I want any of you to miss or sacrifice important family obligations for work.
"Family obligations include but are not limited to family birthdays, anniversaries, weddings, any religious ceremonies such as first communions and bar mitzvahs, graduations, and times of need such as illness or a loss in the family.
"This is very important to me. In fact, I will go so far as to say that if I find out that you are working with me while missing important family responsibilities, it will disappoint me greatly.
"This has been an unwritten rule since my days in the senate."
He concluded: "Thank you all for the hard work."
For Biden, the hard work is just about to get started. He was announced as the President Elect - in line to become the 46th President of the United States - on Saturday afternoon after a protracted and bitter election against Republican sitting president Donald Trump.
Biden eventually managed to pass the 270 Electoral College votes needed to form a new administration, so it stands to reason that he's going to be a busy man over the coming months and years.
At least his staff will be able to count on their boss not to take valuable time away from their families.
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