"Just a heads-up ..."

• "Just so you know ...," in a memo: Abbr
• Header on many a forwarded email
• "I thought this'd be helpful" acronym
• Post-it note abbr.
• Memo opener, often
• Murphy Brown's fictional program
• "This might be of interest ...," for short
• Letters at the top of an interoffice memo
• "Thought you'd like to know" letters

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 ...