Note about global install via npm

README.md

@@ -9,7 +9,7 @@ The annotated source code is included in the `docs/` folder.
 Check out a working copy of the source code with [Git](http://git-scm.com), or install `servedir` via [npm](http://npmjs.org). The latter will also install `servedir` into the system's `bin` path.
 
     $ git clone git://github.com/rem/servedir.git
-    $ npm install servedir
+    $ npm install servedir -g
 
 Alternatively, `servedir` can be run directly from the repository using Node: