Assuming you talking about whiskey, just on the label. This from the BAM
8. TREATMENT WITH WOOD · DISCLOSURE “COLORED AND FLAVORED WITH WOOD _________” (insert chips, slabs, extracts, etc., as appropriate) is required on labels to indicate treatment with wood · APPLICATION Applies only to whisky and brandy treated – other than through contact with oak containers – with wood: in any manner or form, either directly or indirectly, e.g., chips, slabs, extracts, etc. At any point during the production or storage process, up to and including the time of bottling