"In case it's of interest ...," on a memo

• Heads-up letters
• "Just like to mention this," initially
• "Oh, by the way ..." letters
• Message starter, for short
• Letters denoting "so you know"
• "Just a heads-up," on a memo
• "This might be of interest ...," for short
• Cluing-in letters
• Letters on a memo

Wikipedia Word definitions in Wikipedia
FYI is a common abbreviation of " for your information ". "FYI" is commonly used in e-mail, instant as on messaging or memo and messages, typically in the message subject, to flag the message as an informational message, with the intent to communicate to ...