Update 'Adding new objects'

Adding-new-objects.md

@@ -112,7 +112,11 @@ So to create a new object, choose one of the two to extend, and then create a cl
 ```
     - You can also use `Function.drawFunction(canvas, ctx, expr, definitionDomain, destinationDomain, drawPoints = true, drawDash = true)` to rapidly draw a function created on the canvas.
 ### Other optional methods:
-update() {
+- `update()`
+    - Called every time a property of the object is changed.
+- `getLabel()`
+    - Shorthand method you can use to get your label string depending on the state of labelContent.
+    - You can extend it to suit your own needs for your objects.
 
 
 ### Registering your object