[development] Custom user data tab not displayed with hook_user

[Steve Edwards]

I took over a site that has custom user data stored in a separate table, and I 
would like to display those fields in a separate tab in the user profile.  I 
figured I could just write a page and form function, but I'd like to integrate 
it with user data.  I have the following hook_user implementation:

function hsi_user($op, &$edit, &$account, $category = NULL) {
switch ($op) {   
 case 'categories':     
      $data[] = array(
        'name' => 'hsi_demo',
        'title' => 'Demographics',
        'weight' => 3,
        'access callback' => TRUE,
      );
      return $data;
    case 'form':
        $data = db_fetch_object(db_query("SELECT bday, gender, nation, 
religion, heard FROM hsi_demo WHERE uid = %d", $account->uid));
        $countries = _hsi_countries();
        
        $fields['hsi_demo']['bday'] = array(
          '#type' => 'date',
          '#title' => 'Birth Date',
          '#default_value' => isset($edit[$field->name]) ? $edit[$field->name] 
: '',
          '#required' => TRUE,
        );
        $fields['hsi_demo']['gender'] = array(
          '#type' => 'select',
          '#title' => 'Gender',
          '#options' => array('m' => 'Male', 'f' => 'Female'),
          '#default_value' => $data->gender,
        );
        $fields['hsi_demo']['nation'] = array(
          '#type' => 'select',
          '#title' => 'Country',
          '#options' => $countries,
          '#default_value' => $data->nation,
        );
        $fields['hsi_demo']['denomination'] = array(
          '#type' => 'select',
          '#title' => 'Denomination',
          '#options' => $countries,
          '#default_value' => $data->denomination,
          '#options' => $denominations,
        );
        return $fields;
    }
}

The problem is, I don't get my Demographics tab displayed.  Do I also need a 
hook_menu entry for this path (i.e. user/%user/edit/hsi_demo)? What else am I 
missing?

Thanks.

Steve