diff --git a/README.md b/README.md
index 11a49e3..c678c8c 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,6 @@ A repository where I backup impress.js presentations.
 ## Rules of thumb
 
 - Each presentation should be in a folder with the name of the presentation.
-- The folder should contain the `index.html` file
-- The folder can have a `style.css` file and other static files like `js` folders.
-- Images should be wither referenced via public url, or placed in a folder called `img` inside the presentation folder.
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+- The folder should contain the `index.html` file (the generated impress.js presentation file)
+- Static referenced assets should be put inside folders like, for example `css/style.css`.
+- Images should be either referenced via public url, or placed in a folder called `img` inside the presentation folder (example: `img/example.jpg`).
\ No newline at end of file
diff --git a/berlin/style.css b/berlin/css/style.css
similarity index 100%
rename from berlin/style.css
rename to berlin/css/style.css