1 files changed, 5 insertions, 2 deletions
diff --git a/image.go b/image.go
index fe9b67f..df9039a 100644
--- a/image.go
+++ b/image.go
@@ -5,19 +5,22 @@ import (
 	"os"
 )
 
+// Pixel contains color between 0 and 255
 type Pixel struct {
 	r, g, b int
 }
 
-type Frame [HEIGHT][WIDTH]Pixel
+// Frame contains image data
+type Frame [Height][Width]Pixel
 
+// Save saves frame to PPM file
 func (frame Frame) Save(filename string) {
 	f, err := os.Create(filename)
 	if err != nil {
 		panic(nil)
 	}
 	defer f.Close()
-	f.WriteString(fmt.Sprintf("P3\n%d %d\n255\n", WIDTH, HEIGHT))
+	f.WriteString(fmt.Sprintf("P3\n%d %d\n255\n", Width, Height))
 	for _, row := range frame {
 		for _, pixel := range row {
 			f.WriteString(fmt.Sprintf("%d %d %d ", pixel.r, pixel.g, pixel.b))