diff --git a/README.md b/README.md
index 1587769..53f292c 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ function PlayState() {
   };
 
   this.draw = function() {
-    penta.clearCanvas();
+    penta.clearCanvas('#333'); // Colored background
 
     this.ball.draw();
   };
diff --git a/demos/circle_example/PlayState.js b/demos/circle_example/PlayState.js
index 56b8b66..c552c52 100644
--- a/demos/circle_example/PlayState.js
+++ b/demos/circle_example/PlayState.js
@@ -23,7 +23,7 @@ function PlayState() {
   };
 
   this.draw = function() {
-    penta.clearCanvas();
+    penta.clearCanvas('#333');
 
     this.ball.draw();
   };