diff --git a/example.html b/example.html
index 37e20a0..fd3b6d9 100644
--- a/example.html
+++ b/example.html
@@ -1,25 +1,63 @@
+<script type="importmap">
+	{
+		"imports": {
+			"nyooom/render": "https://cdn.jsdelivr.net/npm/nyooom/render.js",
+			"controller-registry": "./src/controller-registry.js"
+		}
+	}
+</script>
+
 <script type="module">
-	import controllers from "./src/controller-registry.js"
-	import {html} from "https://cdn.jsdelivr.net/npm/nyooom/render.js"
+	// Import nyooom to easily generate HTML nodes
+	import {html} from "nyooom/render"
 
-	Object.defineProperty(HTMLElement.prototype, "controllers", {
-		get() { return controllers.list(this) }
+	// The actual library
+	import controllers from "controller-registry"
+
+	// Define a basic word filter controller for input elements
+	controllers.define("filter", (element, detach) => {
+		element.addEventListener("input", event => {
+			if (element.value.toLowerCase() === "scunthorpe") {
+				element.value = ""
+				alert("Evil word detected, deleting input permanently!")
+			}
+		}, detach) // Alternatively: {signal: detach.signal}
 	})
 
-	controllers.define("red", async (element, disconnected) => {
-		const before = element.style.color
-		element.style.color = "red"
-		element.addEventListener("click", () => element.controllers.remove("red"), disconnected)
-		await disconnected
-		element.style.color = before
-	})
-
-	controllers.define("asterisk", async (element, disconnected) => {
-		const asterisk = html.span("*", {controller: ["red"]})
-		element.append(asterisk)
-		await disconnected
-		asterisk.remove()
+	// Define a more complex filter for form elements to enable or disable filters
+	controllers.define("optional-filter", async (element, detach) => {
+		const checkBox = html.div(html.label(
+			html.input({
+				type: "checkbox",
+				checked: true,
+				input: ({target: {checked}}) => {
+					element
+						.querySelectorAll("input:not([type='checkbox'])")
+						.forEach(input => controllers.list(input).toggle("filter", checked))
+				}
+			}),
+			html.span("Enable filter")
+		))
+		element.append(checkBox)
+		// Detach is a promise, so we can just pause the function until
+		// it's time for cleanup to happen
+		await detach
+		checkBox.remove()
 	})
 </script>
 
-<h1 controller="asterisk">Hello, World!</h1>
+<style>
+	[controller~="filter"] {
+		outline: 3px solid #82f6;
+		border-radius: .2em;
+	}
+</style>
+
+<form controller="optional-filter">
+	<div>
+		<label>
+			<span>Where are you from?</span>
+			<input controller="filter"></input>
+		</label>
+	</div>
+</form>
diff --git a/src/controller-registry.js b/src/controller-registry.js
index 2c45fdf..8945dc3 100644
--- a/src/controller-registry.js
+++ b/src/controller-registry.js
@@ -22,18 +22,25 @@ export class ControllerList {
 		this.#element.setAttribute(this.#attribute, [...set].join(" "))
 	}
 
+	/** @param {String} name */
 	contains(name) {
 		return this.#set.has(name)
 	}
 
+	/** @param {String} name */
 	add(name) {
 		this.toggle(name, true)
 	}
 
+	/** @param {String} name */
 	remove(name) {
 		this.toggle(name, false)
 	}
 
+	/**
+	 * @param {String} name
+	 * @param {String} replacement
+	 */
 	replace(name, replacement) {
 		const set = this.#set
 		if (set.has(name)) {
@@ -46,6 +53,10 @@ export class ControllerList {
 		}
 	}
 
+	/**
+	 * @param {String} name
+	 * @param {Boolean} force
+	 */
 	toggle(name, force) {
 		const set = this.#set
 		if (force === true) {
@@ -83,29 +94,42 @@ export class ControllerRegistry {
 	/** @type {WeakMap<HTMLElement,Map<String,Object>>} */
 	#attached = new WeakMap()
 
-	/** @type {Map<String,Set<HTMLElement>} */
+	/** @type {Map<String,Set<HTMLElement>>} */
 	#waiting = new Map()
 
-	/** @type {Map<Strong,(HTMLElement, AbortSignal)=>void>} */
+	/** @type {Map<String,(element: HTMLElement, signal: AbortSignal)=>void>} */
 	#defined = new Map()
 
 	#attribute
 
+	/** @typedef {HTMLElement} Root */
+
+	/**
+	 * @param {Root} root
+	 * @param {String} attribute
+	 */
 	constructor(root, attribute="controller") {
 		this.#attribute = attribute
 		this.#observer.observe(root, {subtree: true, childList: true, attributes: true, attributeFilter: [attribute], attributeOldValue: false})
 		this.upgrade(root)
 	}
 
+	/**
+	 * @param {Root} root
+	 */
 	upgrade(root) {
 		root.querySelectorAll(`[${this.#attribute}]`).forEach(element => this.#update(element))
 	}
 
+	/**
+	 * @param {String} name
+	 * @param {Function} callback
+	 */
 	define(name, callback) {
 		if (("function" == typeof callback) && callback.prototype) {
 			callback = async (element, disconnected) => {
-				const {proxy, revoke} = Proxy.reevocable(element)
-				const controller = new callback(proxy)
+				const {proxy, revoke} = Proxy.revocable(element, {})
+				const controller = new callback(proxy, disconnected)
 				await disconnected
 				revoke()
 				if ("detach" in controller) controller.detach(element)