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@@ -9,6 +9,20 @@ experience.
 
 
 ## Usage
+Let's say we want to modify the font of an article on `www.example.com`. Add an
+`www.example.com.css` file in the extension's `css/` directory:
+
+``` css
+/* legibility/css/www.example.com.css */
+article {
+	font: 18px/1.7em Georgia !important;
+}
+```
+
+Upon reloading the page, the custom stylesheet should now be applied.
+
+Stylesheets must use a filename matching the website's domain (including
+subdomains), and terminated by a `.css` extension.
 
 
 ## Install