Organizing Controllers into Sub-Directories

I'm looking to organize controllers into sub-directories per instructions at http://www.codeigniter.com/userguide3/ge...irectories

However, it doesn't work and I'm not sure what's missing.

Going to http://www.foo.com/members goes to the member login page as expected.
Going to http://www.foo.com/members/summary gives a 404 error. Putting the logic for summary inside of controllers/Members.php works but there will be many more files and related logic so it's better if I can organize into sub-directories.

Folder structure (simplified):

Code:

-www
--application
---controllers
----members
-----Summary.php (should show member summary info... not working)
----Members.php (contains login form and logic... works)
--views
---members
----login.php (called from Members.php controller... works)
----summary.php (should be called from members/Summary.php controller... not working)
--assets
--system
--.htaccess

.htaccess file:

Code:

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]

What is the best to adjust to get this working? the .htaccess file? the routes.php file? readjust the folder structure? something else? Thank you in advance!