diff --git a/README.md b/README.md
index 6021cd9..51581de 100644
--- a/README.md
+++ b/README.md
@@ -5,10 +5,11 @@ https://observablehq.com/@tmcw/octree-color-quantization
 
 inspired by to https://github.com/objectProfessionals/movieMaps
 
+```
 fn test_big_image() -> Result<(), ImageError> {
     let src: RgbaImage = image::open("some_image.jpg").unwrap().into_rgba8();
-
-    let out = quantize(&src, 256);
-    out.save_with_format("output.jpg", image::ImageFormat::Jpeg)?;
+    let dest = quantize(&src, 256);
+    dest.save_with_format("output.jpg", image::ImageFormat::Jpeg)?;
     Ok(())
-}
\ No newline at end of file
+}
+```
\ No newline at end of file