diff --git a/R/plot_aagi.R b/R/plot_aagi.R
index 446c664..871e17a 100644
--- a/R/plot_aagi.R
+++ b/R/plot_aagi.R
@@ -29,7 +29,7 @@
 #' @export
 #'
 plot_aagi <- function(x,
-                      y,
+                      y = NULL,
                       ...) {
 
   if (is.null(col)) {
diff --git a/man/plot_aagi.Rd b/man/plot_aagi.Rd
index fe61042..94621a2 100644
--- a/man/plot_aagi.Rd
+++ b/man/plot_aagi.Rd
@@ -4,7 +4,7 @@
 \alias{plot_aagi}
 \title{Basic X-Y Plotting Using a Unified AAGI Style and Typography}
 \usage{
-plot_aagi(x, y, ...)
+plot_aagi(x, y = NULL, ...)
 }
 \arguments{
 \item{x}{the coordinates of points in the plot. Alternatively, a single