diff --git a/year25/day9/day9.go b/year25/day9/day9.go
index 203b657..bf96a71 100644
--- a/year25/day9/day9.go
+++ b/year25/day9/day9.go
@@ -22,7 +22,7 @@ type Rectangle struct {
 }
 
 func (r Rectangle) String() string {
-	v := r.Vertexes()
+	v := r.Vertices()
 	var b bytes.Buffer
 	fmt.Fprintln(&b, r.Top, r.Bottom)
 	for _, v := range v {
@@ -31,7 +31,7 @@ func (r Rectangle) String() string {
 	fmt.Fprintf(&b, " a = %f", r.Area)
 	return b.String()
 }
-func (r Rectangle) Vertexes() (v [4]Vertex) {
+func (r Rectangle) Vertices() (v [4]Vertex) {
 	v[0] = Vertex{
 		Start:  r.Top,
 		End:    geometry.NewPoint(r.Top.Line, r.Bottom.Col),
diff --git a/year25/day9/part2.go b/year25/day9/part2.go
index 7a4d118..14865ca 100644
--- a/year25/day9/part2.go
+++ b/year25/day9/part2.go
@@ -49,7 +49,7 @@ func Part2(ctx aoc.Context) (result int, err error) {
 	rectangles := day9FindRectangles(points)
 
 	for _, rectangle := range rectangles {
-		rectangleVertices := rectangle.Vertexes()
+		rectangleVertices := rectangle.Vertices()
 
 		if DEBUG {
 			dg := debugGrid.Clone()