diff --git a/R/calc_gsw_change.R b/R/calc_gsw_change.R
index 4c3e317e..aac48a5b 100644
--- a/R/calc_gsw_change.R
+++ b/R/calc_gsw_change.R
@@ -17,7 +17,8 @@
 #' "extract" or "exactextract". Default: "extract".
 #' @param stats_gsw Aggregation function with which the data are combined.
 #' Default: "mean".
-#' @return A tibble
+#' @return A tibble containing the aggregated GSW change indicator. The column
+#' name is a concatenation of "global_surface_water_change_" + \code{stats_gsw}.
 #' @keywords internal
 #' @include register.R
 #' @noRd
diff --git a/R/calc_gsw_occurrence.R b/R/calc_gsw_occurrence.R
index 9fd51c0b..c8471e65 100644
--- a/R/calc_gsw_occurrence.R
+++ b/R/calc_gsw_occurrence.R
@@ -15,7 +15,9 @@
 #' "extract" or "exactextract". Default: "extract".
 #' @param stats_gsw Aggregation function with which the data are combined.
 #' Default: "mean".
-#' @return A tibble
+#' @return A tibble containing the aggregated occurrence indicator. The column
+#' name is a concatenation of "global_surface_water_occurrence_" +
+#' \code{stats_gsw}.
 #' @keywords internal
 #' @include register.R
 #' @noRd
diff --git a/R/calc_gsw_recurrence.R b/R/calc_gsw_recurrence.R
index ff02dcdd..eb9c3a6f 100644
--- a/R/calc_gsw_recurrence.R
+++ b/R/calc_gsw_recurrence.R
@@ -16,7 +16,9 @@
 #' "extract" or "exactextract". Default: "extract".
 #' @param stats_gsw Aggregation function with which the data are combined.
 #' Default: "mean".
-#' @return A tibble
+#' @return A tibble containing the aggregated recurrence indicator. The column
+#' name is a concatenation of "global_surface_water_recurrence_" +
+#' \code{stats_gsw}.
 #' @keywords internal
 #' @include register.R
 #' @noRd
diff --git a/R/calc_gsw_seasonality.R b/R/calc_gsw_seasonality.R
index cec8ed9c..f5b87949 100644
--- a/R/calc_gsw_seasonality.R
+++ b/R/calc_gsw_seasonality.R
@@ -13,7 +13,9 @@
 #' "extract" or "exactextract". Default: "extract".
 #' @param stats_gsw Aggregation function with which the data are combined.
 #' Default: "mean".
-#' @return A tibble
+#' @return A tibble containing the aggregated seasonality indicator. The column
+#' name is a concatenation of "global_surface_water_seasonality_" +
+#' \code{stats_gsw}.
 #' @keywords internal
 #' @include register.R
 #' @noRd
diff --git a/R/calc_gsw_transitios.R b/R/calc_gsw_transitios.R
index b3b25425..e1d3c162 100644
--- a/R/calc_gsw_transitios.R
+++ b/R/calc_gsw_transitios.R
@@ -21,7 +21,11 @@
 #'
 #' @param x A single polygon for which to calculate the GSW statistics.
 #' @param global_surface_water_transitions The GSW Transitions data source.
-#' @return A tibble
+#' @return A tibble with two columns
+#' \itemize{
+#'   \item class: Surface water transition class
+#'   \item area: Area in ha.
+#' }
 #' @keywords internal
 #' @include register.R
 #' @noRd