diff --git a/Project-Structure.md b/Project-Structure.md
index e115c24..6a7d27e 100644
--- a/Project-Structure.md
+++ b/Project-Structure.md
@@ -7,4 +7,13 @@ The ``.json`` language files are located in ``/locales`` and are separated by na
 
 ## Source code
 We use [TypeScript](https://www.typescriptlang.org/) (JavaScript with types).
-The ``.ts`` source files are located in ``/src/`` and will be  compiled to ``.js`` in the ``/dist/`` directory.
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+The ``.ts`` source files are located in ``/src/`` and will be  compiled to ``.js`` in the ``/dist/`` directory.
+
+### Middlewares
+All Express [Middlewares](http://expressjs.com/en/guide/writing-middleware.html) are in the directory ``/src/middlewares/`` and need to be manually loaded in ``/src/Server.ts``.
+
+### Routes
+All Express [Router](http://expressjs.com/en/4x/api.html#router) Routes are in the directory ``/src/routes/`` and are automatically registered.
+
+### Util
+All Utility functions are in the directory ``/src/util/``.
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