FYI Capitalization and Punctuation
FYI/fyi abbreviates “for your information,” especially in messages and email. Cambridge records uppercase and lowercase forms, so capitalization should follow context or house style rather than a universal rule.
“FYI” means “for your information.” Cambridge records both FYI and fyi in business contexts, without internal periods.
Key details
Important caveats
Punctuation Boundary
The Cambridge forms are written without internal periods; sentence punctuation still follows ordinary syntax.
Further guidance
Capitalization
Cambridge Business English records “FYI” and “fyi.”
Meaning
FYI abbreviates “for your information” and is commonly used when passing along information someone should see or know.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- FYI — Cambridge Dictionary (opens in a new tab)Cambridge Dictionary · FYI/fyi meaning and use in email/business communication