diff --git a/README.md b/README.md
index 5006400..af5759f 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ import "github.com/muesli/kmeans"
 km := kmeans.New()
 
 // set up "random" data points (float64 values between 0.0 and 1.0)
-d := []kmeans.Point{}
+var d kmeans.Points
 for x := 0; x < 255; x += 4 {
 	for y := 0; y < 255; y += 4 {
 		d = append(d, kmeans.Point{
diff --git a/examples/colorpalette/main.go b/examples/colorpalette/main.go
index 47bf147..70e1822 100644
--- a/examples/colorpalette/main.go
+++ b/examples/colorpalette/main.go
@@ -32,10 +32,9 @@ var (
 
 func main() {
 	// Create data points in the CIE L*a*b color space
-	d := []kmeans.Point{}
-
 	// l for lightness channel
 	// a, b for color channels
+	var d kmeans.Points
 	for l := 30; l < 255; l += 16 {
 		for a := 0; a < 255; a += 16 {
 			for b := 0; b < 255; b += 16 {
diff --git a/examples/simple/main.go b/examples/simple/main.go
index 0afc732..e80e20e 100644
--- a/examples/simple/main.go
+++ b/examples/simple/main.go
@@ -9,7 +9,7 @@ import (
 func main() {
 	// set up "random" data points (float64 values between 0.0 and 1.0)
 	km := kmeans.New()
-	d := []kmeans.Point{}
+	var d kmeans.Points
 	for x := 0; x < 255; x += 4 {
 		for y := 0; y < 255; y += 4 {
 			d = append(d, kmeans.Point{