A reference of the field variable is missing

If I just add the code on the sidebar the console says that the field variable is undefined, so I've included a reference with the variable in  the initial code block

site/content/tutorial/06-bindings/14-component-this/text.md

@@ -5,6 +5,10 @@ title: Binding to component instances
 Just as you can bind to DOM elements, you can bind to component instances themselves. For example, we can bind the instance of `<InputField>` to a prop named `field` in the same way we did when binding DOM Elements
 
 ```html
+<script>
+	let field;
+</script>
+
 <InputField bind:this={field} />
 ```