@@ -670,7 +670,7 @@ Grouping
670670-- | `By`s are used in `group` to reference a list of columns which are then
671671-- used to group together those rows in a table that have the same values
672672-- in all the columns listed. @By \#col@ will reference an unambiguous
673−-- column @col@; otherwise @By2 \#tab \! \#col@ will reference a table
673+-- column @col@; otherwise @By2 (\#tab \! \#col)@ will reference a table
674674-- qualified column @tab.col@.
675675data By
676676 (tables :: TablesType)