document a few more features

content/Input/_index.md

@@ -57,6 +57,12 @@ var mouseX = Inputs.Mouse.X;
 var deltaMouseY = Inputs.Mouse.DeltaY;
 ```
 
+You can also read scroll wheel movement. Negative values are down-scrolls, positive values are up-scrolls.
+
+```cs
+var wheel = Inputs.Mouse.Wheel;
+```
+
 `RelativeMode` hides the mouse and does not update the position of the mouse while still returning movement deltas.
 This is ideal for creating FPS-style controls. To enable it, simply do:
 
@@ -98,3 +104,15 @@ var rightMotorAmount = 0.5;
 var durationInMilliseconds = 10;
 gamepad.SetVibration(leftMotorAmount, rightMotorAmount, durationInMilliseconds)
 ```
+
+## Text Input
+
+Sometimes you might want to do something like divert keyboard inputs into a text box.
+`Inputs` provides a `TextInput` callback that you can hook into for this purpose.
+
+```cs
+Inputs.TextInput += c =>
+{
+    ImGui.GetIO().AddInputCharacter(c);
+}
+```