Add filesystem location of downloaded vagrant boxes

docs/boxes.md

@@ -28,7 +28,8 @@ $ vagrant box add ubuntu_base http://files.vagrantup.com/base.box
 
 The name used with the `vagrant box add` command is the name used to
 reference the box from that point forward. Any box can be named anything
-you want.
+you want.  Boxes that are added using `vagrant box add` are global to the
+vagrant install, and they are stored at `~/.vagrant/boxes` on the local filesystem.
 
 **Note:** The default Vagrantfile created with `vagrant init` defaults to
 using a box named "base." This is why in the getting started guide, the

docs/getting-started/boxes.md

@@ -32,9 +32,9 @@ while box installation is covered in more detail:
 $ vagrant box add getting_started http://files.vagrantup.com/getting_started.box
 {% endhighlight %}
 
-Installed boxes are global to the current vagrant installation. This means
-that once the rails box has been added, it can be used by multiple projects
-at the same time. Each project uses the box as a _base_ only, so once the
+Installed boxes reside in ~/.vagrant/boxes, and they are global to the current vagrant 
+installation. This means that once the rails box has been added, it can be used by 
+multiple projects at the same time. Each project uses the box as a _base_ only, so once the
 project VM is created, modifications can be made without affecting other
 projects which may use the same box.
 
@@ -47,8 +47,9 @@ the filename and logical name are equal in this case.
 ## Removing Boxes
 
 Just as easily as they're added, boxes can be removed as well. The following
-is an example command to remove a box. **Do not run this command if you're
-following the guide. It is just an example.**
+is an example command to remove a box. 
+
+**Do not run this command if you're following the guide. It is just an example.**
 
 {% highlight bash %}
 $ vagrant box remove my_box
@@ -87,4 +88,4 @@ $ vagrant up
 ...
 $ vagrant down
 ...
-{% endhighlight %}
+{% endhighlight %}