diff --git a/README.md b/README.md
index 702d193..92ba633 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@ fn main() {
     let mut s = Sprite::new("duck.png", 500, 400).unwrap();
     game.run(|ctx, event_pump| {
         i = (i + 1.0) % 360.0;
+        ctx.set_background_colour(i as u8, 64, 255);
 
         let (start_x, start_y) = s.position();
         let m = sdl2::mouse::MouseState::new(event_pump.as_ref());
diff --git a/src/lib.rs b/src/lib.rs
index 98c9443..379f903 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -10,6 +10,7 @@
 //!     let mut s = Sprite::new("duck.png", 500, 400).unwrap();
 //!     game.run(|ctx, event_pump| {
 //!         i = (i + 1.0) % 360.0;
+//!         ctx.set_background_colour(i as u8, 64, 255);
 //!
 //!         let (start_x, start_y) = s.position();
 //!         let m = sdl2::mouse::MouseState::new(event_pump.as_ref());