Correct use of URL Hooks

[markus_blue_tomato]

I have tried to use following code in _init.php and _ready.php:

wire()->addHook('/hello-world', function($event) {
    return 'Hello World';
});

But got this back when I visit /hello-world:

Ouch… Error: Exception: Path hooks must be attached during init or ready states (in wire/core/WireHooks.php line 834)

When I add the hook in init.php I get the 404 Page.

Can anyone help me here?

[markus_blue_tomato]

Ooooooh - fixed:

First I thought site/templates/_init.php is the same as site/init.php and then had init.php in site/templates instead of site. ?