Tweak README

README.md

@@ -29,7 +29,7 @@ Here's a development workflow that we recommend you use.
 
 Improve the mouse so it behaves like a real paintbrush. In other words, allow the user to paint by clicking and dragging across the canvas. For this, you'll need a combination of the `mousedown`, `mouseenter`, and `mouseup` events.
 
-**TIP:** The [`mouseenter` event](https://developer.mozilla.org/en-US/docs/Web/Events/mouseenter) doesn't bubble to up the DOM tree.
+**TIP:** The [`mouseenter` event](https://developer.mozilla.org/en-US/docs/Web/Events/mouseenter) doesn't bubble up the DOM tree.
 
 ### Bonus 2