diff --git a/themes.qmd b/themes.qmd
index a899a29d..b534678c 100644
--- a/themes.qmd
+++ b/themes.qmd
@@ -559,7 +559,7 @@ base_f + theme(
 
 When saving a plot to use in another program, you have two basic choices of output: raster or vector: \index{Exporting} \index{Saving output}
 
--   Vector graphics describe a plot as sequence of operations: draw a line from $(x_1, y_1)$ to $(x_2, y_2)$, draw a circle at $(x_3, x_4)$ with radius $r$.
+-   Vector graphics describe a plot as sequence of operations: draw a line from $(x_1, y_1)$ to $(x_2, y_2)$, draw a circle at $(x_3, y_3)$ with radius $r$.
     This means that they are effectively 'infinitely' zoomable; there is no loss of detail.
     The most useful vector graphic formats are pdf and svg.