2014-02-10: mark -s ... as code.

mark -s ... as code.

diff --git a/README.txt b/README.txt
--- a/README.txt
+++ b/README.txt
@@ -96,7 +96,7 @@ Basic Options
 Customization
 -------------
 
-To change the appearance of your site, create it once and then copy style.css and print.css from `._site/`. Adapt them and use -s path/to/your/screen.css and  -p path/to/your/print.css to use your adaptions.
+To change the appearance of your site, create it once and then copy style.css and print.css from `._site/`. Adapt them and use `-s path/to/your/screen.css` and  `-p path/to/your/print.css` to use your adaptions.