diff --git a/R/spiro.R b/R/spiro.R
index 212ebb8..34fa313 100644
--- a/R/spiro.R
+++ b/R/spiro.R
@@ -2,11 +2,12 @@
 #'
 #' This function generates a generative art ggplot object in a spirograph style.
 #'
-#' @param n_x Number of spirals per row.
-#' @param n_y Number of spirals per column.
-#' @param d Diameter.
-#' @param R Outer radius.
-#' @param r Inner radius.
+#' @param n_x Number of spirals per row. Default 10.
+#' @param n_y Number of spirals per column. Default 10.
+#' @param d Diameter. Default 10.
+#' @param R Outer radius. Default 4.
+#' @param r Inner radius. Default 1.
+#' @param linewidth Width on lines. Default 0.5.
 #' @param col_palette Vector of colours. Default "white".
 #' @param bg_col Background colour. Default "grey20".
 #' @param s Seed value. Default 1234.
@@ -18,12 +19,13 @@ spiro <- function(n_x = 10,
                   d = 10,
                   R = 4, # nolint
                   r = 1,
+                  linewidth = 0.5,
                   col_palette = "white",
                   bg_col = "grey20",
                   s = 1234) {
   set.seed(s)
   plot_data <- tibble::as_tibble(expand.grid(x = 1:n_x, y = 1:n_y)) |>
-    dplyr::mutate(dplyr::across(c(.data$x, .data$y), ~ .x * d))
+    dplyr::mutate(dplyr::across(c("x", "y"), ~ .x * d))
   plot_data$cols <- sample(col_palette, size = nrow(plot_data), replace = TRUE)
   p <- ggplot2::ggplot(data = plot_data) +
     ggforce::geom_spiro(ggplot2::aes(
@@ -34,7 +36,8 @@ spiro <- function(n_x = 10,
       y0 = .data$y,
       colour = .data$cols,
       outer = TRUE
-    )) +
+    ),
+    size = linewidth) +
     ggplot2::scale_colour_identity() +
     ggplot2::coord_fixed() +
     ggplot2::theme_void() +
diff --git a/man/spiro.Rd b/man/spiro.Rd
index 49ee6de..704c3bf 100644
--- a/man/spiro.Rd
+++ b/man/spiro.Rd
@@ -10,21 +10,24 @@ spiro(
   d = 10,
   R = 4,
   r = 1,
+  linewidth = 0.5,
   col_palette = "white",
   bg_col = "grey20",
   s = 1234
 )
 }
 \arguments{
-\item{n_x}{Number of spirals per row.}
+\item{n_x}{Number of spirals per row. Default 10.}
 
-\item{n_y}{Number of spirals per column.}
+\item{n_y}{Number of spirals per column. Default 10.}
 
-\item{d}{Diameter.}
+\item{d}{Diameter. Default 10.}
 
-\item{R}{Outer radius.}
+\item{R}{Outer radius. Default 4.}
 
-\item{r}{Inner radius.}
+\item{r}{Inner radius. Default 1.}
+
+\item{linewidth}{Width on lines. Default 0.5.}
 
 \item{col_palette}{Vector of colours. Default "white".}