Update README.md

README.md

@@ -109,7 +109,7 @@ To set up the development environment, run:
  2. *(as root)* create `/data/dev` and make it owned by the developer
 	<pre>
 	sudo mkdir -p    /data/dev
-	sudo chown -R USER:GROUP /data
+	sudo chown USER: /data/dev
 	</pre>
 
  3. source the `prepare.sh` script (to be run every time before you start working)