From 31b9f9f57f3906ef0e2d1c77630d81e5b50e54ff Mon Sep 17 00:00:00 2001
From: Patrick <patrick@peakinformatik.com>
Date: Wed, 14 Jan 2015 21:16:39 +0100
Subject: [PATCH] explain __DIR__. solves #13

---
 01-front-controller.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/01-front-controller.md b/01-front-controller.md
index 349c513..75315ea 100644
--- a/01-front-controller.md
+++ b/01-front-controller.md
@@ -22,6 +22,8 @@ Inside the `public` folder you can now create your `index.php`. Remember that yo
 require __DIR__ . '/../src/Bootstrap.php';
 ```
 
+`__DIR__` is a [magic constant](http://php.net/manual/en/language.constants.predefined.php) that contains the path of the directory. By using it, you can make sure that the `require` always uses the same relative path to the file it is used in. Otherwise, if you call the `index.php` from a different folder it will not find the file.
+
 The `Bootstrap.php` will be the file that wires your application together. We will get to it shortly.
 
 The rest of the public folder is reserved for your public asset files (like JavaScript files and stylesheets).