The tab_source_note() function

Use gtcars to create a gt table. Use tab_source_note() to add a source note to the table footer that cites the data source.

gtcars |>
  dplyr::select(mfr, model, msrp) |>
  dplyr::slice(1:5) |>
  gt() |>
  tab_source_note(source_note = "From edmunds.com")

mfr	model	msrp
Ford	GT	447000
Ferrari	458 Speciale	291744
Ferrari	458 Spider	263553
Ferrari	458 Italia	233509
Ferrari	488 GTB	245400
From edmunds.com