diff --git a/R/data_tabulate.R b/R/data_tabulate.R
index 9452cb4f2..fc2374cef 100644
--- a/R/data_tabulate.R
+++ b/R/data_tabulate.R
@@ -21,6 +21,10 @@
 #' table for printing. This affects only printing, not the returned object.
 #' @param weights Optional numeric vector of weights. Must be of the same length
 #' as `x`. If `weights` is supplied, weighted frequencies are calculated.
+#' @param proportions Optional character string, indicating the type of
+#' percentages to be calculated. Only applies to crosstables, i.e. when `by` is
+#' not `NULL`. Can be `"row"`, `"column"` or `"cell"`, to calculate row, column
+#' or cell percentages, respectively.
 #' @param ... not used.
 #' @inheritParams find_columns
 #'
diff --git a/inst/WORDLIST b/inst/WORDLIST
index d48430478..5b12a2523 100644
--- a/inst/WORDLIST
+++ b/inst/WORDLIST
@@ -50,6 +50,8 @@ bmwiernik
 codebook
 codebooks
 coercible
+crosstable
+crosstables
 csv
 de
 doi
diff --git a/man/data_tabulate.Rd b/man/data_tabulate.Rd
index 79592ac4f..55f7d316c 100644
--- a/man/data_tabulate.Rd
+++ b/man/data_tabulate.Rd
@@ -55,6 +55,11 @@ as \code{x}. If \code{weights} is supplied, weighted frequencies are calculated.
 \item{include_na}{Logical, if \code{TRUE}, missing values are included in the
 frequency or crosstable, else missing values are omitted.}
 
+\item{proportions}{Optional character string, indicating the type of
+percentages to be calculated. Only applies to crosstables, i.e. when \code{by} is
+not \code{NULL}. Can be \code{"row"}, \code{"column"} or \code{"cell"}, to calculate row, column
+or cell percentages, respectively.}
+
 \item{name}{Optional character string, which includes the name that is used
 for printing.}