Update event-handling.md

wiki/input/event-handling.md

@@ -54,7 +54,7 @@ The next five methods report mouse/touch events:
   * *touchUp()*: Called when a finger was lifted from the screen or a mouse button was released. Reports the last known coordinates as well as the pointer index and mouse button (always `Buttons.Left` for touch screens).
   * *touchDragged()*: Called when a finger is being dragged over the screen or the mouse is dragged while a button is pressed. Reports the coordinates and pointer index. The button is not reported as multiple buttons could be pressed while the mouse is being dragged. You can use `Gdx.input.isButtonPressed()` to check for a specific button.
   * *mouseMoved()*: Called when the mouse is moved over the screen without a mouse button being down. This event is only relevant on the desktop and will never occur on touch screen devices where you only get `touchDragged()` events.
-  * *scrolled()*: Called when the scroll wheel of the mouse was turned. Reports a positive or a negative value depending on the direction of spin. This will never be called for touch screen devices.
+  * *scrolled()*: Called when the scroll wheel of the mouse was turned. Reports a positive value, a negative value or zero depending on the direction of spin. This will never be called for touch screen devices.
 
 Each of the methods returns a `boolean`. We'll look into why that is in the InputMultiplexer section below.