diff --git a/modules/aggregator/aggregator-rtl.css b/modules/aggregator/aggregator-rtl.css
index ea59ca3a19f10c0103741d0d7f02ca6d1406fc28..057d01565853080178de063df2e6dc65966dd5bd 100644
--- a/modules/aggregator/aggregator-rtl.css
+++ b/modules/aggregator/aggregator-rtl.css
@@ -1,3 +1,6 @@
+/**
+ * Right-to-Left styles for theme in the Aggregator module.
+ */
 
 #aggregator .feed-source .feed-icon {
   float: left;
diff --git a/modules/aggregator/aggregator.admin.inc b/modules/aggregator/aggregator.admin.inc
index 8b817c0fafc4fdce57952e609c678f4b469fd121..443facb129950a14dc9299b1269e13c08e7bacea 100644
--- a/modules/aggregator/aggregator.admin.inc
+++ b/modules/aggregator/aggregator.admin.inc
@@ -2,11 +2,11 @@
 
 /**
  * @file
- * Admin page callbacks for the aggregator module.
+ * Administration page callbacks for the Aggregator module.
  */
 
 /**
- * Menu callback; displays the aggregator administration page.
+ * Page callback: Displays the Aggregator module administration page.
  */
 function aggregator_admin_overview() {
   return aggregator_view();
@@ -16,7 +16,7 @@ function aggregator_admin_overview() {
  * Displays the aggregator administration page.
  *
  * @return
- *   The page HTML.
+ *   A HTML-formatted string with administration page content.
  */
 function aggregator_view() {
   $result = db_query('SELECT f.fid, f.title, f.url, f.refresh, f.checked, f.link, f.description, f.hash, f.etag, f.modified, f.image, f.block, COUNT(i.iid) AS items FROM {aggregator_feed} f LEFT JOIN {aggregator_item} i ON f.fid = i.fid GROUP BY f.fid, f.title, f.url, f.refresh, f.checked, f.link, f.description, f.hash, f.etag, f.modified, f.image, f.block ORDER BY f.title');
@@ -56,8 +56,8 @@ function aggregator_view() {
  * Form constructor for adding and editing feed sources.
  *
  * @param $feed
- *   If editing a feed, the feed to edit as a PHP stdClass value; if adding a
- *   new feed, NULL.
+ *   (optional) If editing a feed, the feed to edit as a PHP stdClass value; if
+ *   adding a new feed, NULL. Defaults to NULL.
  *
  * @ingroup forms
  * @see aggregator_form_feed_validate()
@@ -165,6 +165,7 @@ function aggregator_form_feed_validate($form, &$form_state) {
  * Form submission handler for aggregator_form_feed().
  *
  * @see aggregator_form_feed_validate()
+ *
  * @todo Add delete confirmation dialog.
  */
 function aggregator_form_feed_submit($form, &$form_state) {
@@ -398,7 +399,7 @@ function _aggregator_parse_opml($opml) {
 }
 
 /**
- * Menu callback; refreshes a feed, then redirects to the overview page.
+ * Page callback: Refreshes a feed, then redirects to the overview page.
  *
  * @param $feed
  *   An object describing the feed to be refreshed.
@@ -590,6 +591,7 @@ function aggregator_form_category_validate($form, &$form_state) {
  * Form submission handler for aggregator_form_category().
  *
  * @see aggregator_form_category_validate()
+ *
  * @todo Add delete confirmation dialog.
  */
 function aggregator_form_category_submit($form, &$form_state) {
diff --git a/modules/aggregator/aggregator.css b/modules/aggregator/aggregator.css
index 13c58ffe70eeeb58f82954a4f75c6c224c1c7633..4285631e87aa657329740a18f33b3b0f717c8386 100644
--- a/modules/aggregator/aggregator.css
+++ b/modules/aggregator/aggregator.css
@@ -1,3 +1,6 @@
+/**
+ * Styles for theme in the Aggregator module.
+ */
 
 #aggregator .feed-source .feed-title {
   margin-top: 0;
diff --git a/modules/aggregator/aggregator.module b/modules/aggregator/aggregator.module
index 93457c68de0adf91d0c2fba6555ae6a3ee065b1e..70f8c5cd828bd63c096419b35336ec1626ca09d7 100644
--- a/modules/aggregator/aggregator.module
+++ b/modules/aggregator/aggregator.module
@@ -266,13 +266,13 @@ function aggregator_menu() {
 }
 
 /**
- * Title callback: Returns a title for aggregatory category pages.
+ * Title callback: Returns a title for aggregator category pages.
  *
  * @param $category
  *   An aggregator category.
  *
  * @return
- *   An aggregator category title.
+ *   A string with the aggregator category title.
  */
 function _aggregator_category_title($category) {
   return $category['title'];
@@ -723,7 +723,7 @@ function theme_aggregator_block_item($variables) {
 }
 
 /**
- * Safely renders HTML content, as allowed.
+ * Renders the HTML content safely, as allowed.
  *
  * @param $value
  *   The content to be filtered.
@@ -739,7 +739,7 @@ function aggregator_filter_xss($value) {
  * Checks and sanitizes the aggregator configuration.
  *
  * Goes through all fetchers, parsers and processors and checks whether they
- * are available. If one is missing resets to standard configuration.
+ * are available. If one is missing, resets to standard configuration.
  *
  * @return
  *   TRUE if this function resets the configuration; FALSE if not.
@@ -775,7 +775,7 @@ function aggregator_sanitize_configuration() {
  *   Items count.
  *
  * @return
- *   Plural-formatted "@count items"
+ *   A string that is plural-formatted as "@count items".
  */
 function _aggregator_items($count) {
   return format_plural($count, '1 item', '@count items');
diff --git a/modules/aggregator/aggregator.pages.inc b/modules/aggregator/aggregator.pages.inc
index cd1c4cb2c08cc0600bc43c248b36aed654c538d5..bfba3fffb0dfe8ff6bd28ceafbf3fd3ac3e40110 100644
--- a/modules/aggregator/aggregator.pages.inc
+++ b/modules/aggregator/aggregator.pages.inc
@@ -2,14 +2,14 @@
 
 /**
  * @file
- * User page callbacks for the aggregator module.
+ * User page callbacks for the Aggregator module.
  */
 
 /**
- * Menu callback; displays the most recent items gathered from any feed.
+ * Page callback: Displays the most recent items gathered from any feed.
  *
  * @return
- *   The items HTML.
+ *   The rendered list of items for the feed.
  */
 function aggregator_page_last() {
   drupal_add_feed('aggregator/rss', variable_get('site_name', 'Drupal') . ' ' . t('aggregator'));
@@ -20,13 +20,15 @@ function aggregator_page_last() {
 }
 
 /**
- * Menu callback; displays all the items captured from a particular feed.
+ * Page callback: Displays all the items captured from the particular feed.
  *
  * @param $feed
  *   The feed for which to display all items.
  *
  * @return
  *   The rendered list of items for a feed.
+ *
+ * @see aggregator_menu()
  */
 function aggregator_page_source($feed) {
   drupal_set_title($feed->title);
@@ -40,13 +42,13 @@ function aggregator_page_source($feed) {
 }
 
 /**
- * Menu callback; displays a form with all items captured from a feed.
+ * Page callback: Displays a form with all items captured from a feed.
  *
  * @param $feed
- *   The feed for which to list all the aggregated items.
+ *   The feed for which to list all of the aggregated items.
  *
  * @return
- *   The rendered list of items for a feed.
+ *   The rendered list of items for the feed.
  *
  * @see aggregator_page_source()
  */
@@ -55,13 +57,13 @@ function aggregator_page_source_form($form, $form_state, $feed) {
 }
 
 /**
- * Menu callback; displays all the items aggregated in a particular category.
+ * Page callback: Displays all the items aggregated in a particular category.
  *
  * @param $category
- *   The category for which to list all the aggregated items.
+ *   The category for which to list all of the aggregated items.
  *
  * @return
-*   The rendered list of items for a category.
+ *   The rendered list of items for the feed.
  */
 function aggregator_page_category($category) {
   drupal_add_feed('aggregator/rss/' . $category['cid'], variable_get('site_name', 'Drupal') . ' ' . t('aggregator - @title', array('@title' => $category['title'])));
@@ -74,13 +76,13 @@ function aggregator_page_category($category) {
 }
 
 /**
- * Menu callback; displays a form containing items aggregated in a category.
+ * Page callback: Displays a form containing items aggregated in a category.
  *
  * @param $category
- *   The category for which to list all the aggregated items.
+ *   The category for which to list all of the aggregated items.
  *
  * @return
-*   The rendered list of items for a category.
+ *   The rendered list of items for the feed.
  *
  * @see aggregator_page_category()
  */
@@ -166,7 +168,7 @@ function aggregator_feed_items_load($type, $data = NULL) {
  *   The feed source URL.
  *
  * @return
- *   The rendered list of items for a feed.
+ *   The rendered list of items for the feed.
  */
 function _aggregator_page_list($items, $op, $feed_source = '') {
   if (user_access('administer news feeds') && ($op == 'categorize')) {
@@ -191,10 +193,14 @@ function _aggregator_page_list($items, $op, $feed_source = '') {
  * @param $items
  *   An array of the feed items.
  * @param $feed_source
- *   The feed source URL.
+ *   (optional) The feed source URL. Defaults to an empty string.
+ *
+ * @return array
+ *   An array of FAPI elements.
  *
- * @ingroup forms
  * @see aggregator_categorize_items_submit()
+ * @see theme_aggregator_categorize_items()
+ * @ingroup forms
  */
 function aggregator_categorize_items($items, $feed_source = '') {
   $form['#submit'][] = 'aggregator_categorize_items_submit';
@@ -334,7 +340,12 @@ function template_preprocess_aggregator_item(&$variables) {
 }
 
 /**
- * Menu callback; displays all the feeds used by the aggregator.
+ * Page callback: Displays all the feeds used by the aggregator.
+ *
+ * @return
+ *   An HTML-formatted string.
+ *
+ * @see aggregator_menu()
  */
 function aggregator_page_sources() {
   $result = db_query('SELECT f.fid, f.title, f.description, f.image, MAX(i.timestamp) AS last FROM {aggregator_feed} f LEFT JOIN {aggregator_item} i ON f.fid = i.fid GROUP BY f.fid, f.title, f.description, f.image ORDER BY last DESC, f.title');
@@ -358,7 +369,12 @@ function aggregator_page_sources() {
 }
 
 /**
- * Menu callback; displays all the categories used by the aggregator.
+ * Page callback: Displays all the categories used by the Aggregator module.
+ *
+ * @return string
+ *   An HTML formatted string.
+ *
+ * @see aggregator_menu()
  */
 function aggregator_page_categories() {
   $result = db_query('SELECT c.cid, c.title, c.description FROM {aggregator_category} c LEFT JOIN {aggregator_category_item} ci ON c.cid = ci.cid LEFT JOIN {aggregator_item} i ON ci.iid = i.iid GROUP BY c.cid, c.title, c.description');
@@ -380,7 +396,10 @@ function aggregator_page_categories() {
 }
 
 /**
- * Menu callback; generate an RSS 0.92 feed of aggregator items or categories.
+ * Page callback: Generates an RSS 0.92 feed of aggregator items or categories.
+ *
+ * @return string
+ *   An HTML formatted string.
  */
 function aggregator_page_rss() {
   $result = NULL;
@@ -448,12 +467,14 @@ function theme_aggregator_page_rss($variables) {
 }
 
 /**
- * Menu callback; generates an OPML representation of all feeds.
+ * Page callback: Generates an OPML representation of all feeds.
  *
  * @param $cid
- *   If set, feeds are exported only from a category with this ID. Otherwise, all feeds are exported.
+ *   (optional) If set, feeds are exported only from a category with this ID.
+ *   Otherwise, all feeds are exported. Defaults to NULL.
+ *
  * @return
- *   The output XML.
+ *   An OPML formatted string.
  */
 function aggregator_page_opml($cid = NULL) {
   if ($cid) {
@@ -468,14 +489,12 @@ function aggregator_page_opml($cid = NULL) {
 }
 
 /**
- * Prints the OPML page for a feed.
+ * Prints the OPML page for the feed.
  *
  * @param $variables
  *   An associative array containing:
  *   - feeds: An array of the feeds to theme.
  *
- * @return void
- *
  * @ingroup themeable
  */
 function theme_aggregator_page_opml($variables) {
diff --git a/modules/aggregator/aggregator.processor.inc b/modules/aggregator/aggregator.processor.inc
index 3f1319c8c118de093cbd48206a4474564df14d11..44ed549962a041390a2a0a0029579b0810a91fcf 100644
--- a/modules/aggregator/aggregator.processor.inc
+++ b/modules/aggregator/aggregator.processor.inc
@@ -131,6 +131,12 @@ function aggregator_form_aggregator_admin_form_alter(&$form, $form_state) {
  *
  * Callback for drupal_map_assoc() within
  * aggregator_form_aggregator_admin_form_alter().
+ *
+ * @param $length
+ *   The desired length of teaser text, in bytes.
+ *
+ * @return
+ *   A translated string explaining the teaser string length.
  */
 function _aggregator_characters($length) {
   return ($length == 0) ? t('Unlimited') : format_plural($length, '1 character', '@count characters');
diff --git a/modules/aggregator/aggregator.test b/modules/aggregator/aggregator.test
index eff31020f104f7b879974de4ded83ff59db49b50..8b95d6e379bb50554ef9e79a77b564f5b5fa5cca 100644
--- a/modules/aggregator/aggregator.test
+++ b/modules/aggregator/aggregator.test
@@ -5,6 +5,9 @@
  * Tests for aggregator.module.
  */
 
+/**
+ * Defines a base class for testing the Aggregator module.
+ */
 class AggregatorTestCase extends DrupalWebTestCase {
   function setUp() {
     parent::setUp('aggregator', 'aggregator_test');
@@ -13,10 +16,15 @@ class AggregatorTestCase extends DrupalWebTestCase {
   }
 
   /**
-   * Create an aggregator feed (simulate form submission on admin/config/services/aggregator/add/feed).
+   * Creates an aggregator feed.
+   *
+   * This method simulates the form submission on path
+   * admin/config/services/aggregator/add/feed.
    *
    * @param $feed_url
-   *   If given, feed will be created with this URL, otherwise /rss.xml will be used.
+   *   (optional) If given, feed will be created with this URL, otherwise
+   *   /rss.xml will be used. Defaults to NULL.
+   *
    * @return $feed
    *   Full feed object if possible.
    *
@@ -33,7 +41,7 @@ class AggregatorTestCase extends DrupalWebTestCase {
   }
 
   /**
-   * Delete an aggregator feed.
+   * Deletes an aggregator feed.
    *
    * @param $feed
    *   Feed object representing the feed.
@@ -44,10 +52,11 @@ class AggregatorTestCase extends DrupalWebTestCase {
   }
 
   /**
-   * Return a randomly generated feed edit array.
+   * Returns a randomly generated feed edit array.
    *
    * @param $feed_url
-   *   If given, feed will be created with this URL, otherwise /rss.xml will be used.
+   *   (optional) If given, feed will be created with this URL, otherwise
+   *   /rss.xml will be used. Defaults to NULL.
    * @return
    *   A feed array.
    */
@@ -68,7 +77,7 @@ class AggregatorTestCase extends DrupalWebTestCase {
   }
 
   /**
-   * Return the count of the randomly created feed array.
+   * Returns the count of the randomly created feed array.
    *
    * @return
    *   Number of feed items on default feed created by createFeed().
@@ -80,10 +89,13 @@ class AggregatorTestCase extends DrupalWebTestCase {
   }
 
   /**
-   * Update feed items (simulate click to admin/config/services/aggregator/update/$fid).
+   * Updates the feed items.
+   *
+   * This method simulates a click to
+   * admin/config/services/aggregator/update/$fid.
    *
    * @param $feed
-   *   Feed object representing the feed.
+   *   Feed object representing the feed, passed by reference.
    * @param $expected_count
    *   Expected number of feed items.
    */
@@ -112,7 +124,7 @@ class AggregatorTestCase extends DrupalWebTestCase {
   }
 
   /**
-   * Confirm item removal from a feed.
+   * Confirms an item removal from a feed.
    *
    * @param $feed
    *   Feed object representing the feed.
@@ -123,7 +135,7 @@ class AggregatorTestCase extends DrupalWebTestCase {
   }
 
   /**
-   * Add and remove feed items and ensure that the count is zero.
+   * Adds and removes feed items and ensure that the count is zero.
    *
    * @param $feed
    *   Feed object representing the feed.
@@ -140,7 +152,7 @@ class AggregatorTestCase extends DrupalWebTestCase {
   }
 
   /**
-   * Pull feed categories from aggregator_category_feed table.
+   * Pulls feed categories from {aggregator_category_feed} table.
    *
    * @param $feed
    *   Feed object representing the feed.
@@ -154,7 +166,11 @@ class AggregatorTestCase extends DrupalWebTestCase {
   }
 
   /**
-   * Pull categories from aggregator_category table.
+   * Pulls categories from {aggregator_category} table.
+   *
+   * @return
+   *   An associative array keyed by category ID and values are set to the
+   *   category names.
    */
   function getCategories() {
     $categories = array();
@@ -165,14 +181,14 @@ class AggregatorTestCase extends DrupalWebTestCase {
     return $categories;
   }
 
-
   /**
-   * Check if the feed name and URL is unique.
+   * Checks whether the feed name and URL are unique.
    *
    * @param $feed_name
    *   String containing the feed name to check.
    * @param $feed_url
    *   String containing the feed URL to check.
+   *
    * @return
    *   TRUE if feed is unique.
    */
@@ -182,10 +198,11 @@ class AggregatorTestCase extends DrupalWebTestCase {
   }
 
   /**
-   * Create a valid OPML file from an array of feeds.
+   * Creates a valid OPML file from an array of feeds.
    *
    * @param $feeds
    *   An array of feeds.
+   *
    * @return
    *   Path to valid OPML file.
    */
@@ -223,7 +240,7 @@ EOF;
   }
 
   /**
-   * Create an invalid OPML file.
+   * Creates an invalid OPML file.
    *
    * @return
    *   Path to invalid OPML file.
@@ -240,7 +257,7 @@ EOF;
   }
 
   /**
-   * Create a valid but empty OPML file.
+   * Creates a valid but empty OPML file.
    *
    * @return
    *   Path to empty OPML file.
@@ -275,7 +292,7 @@ EOF;
    * Creates sample article nodes.
    *
    * @param $count
-   *   (optional) The number of nodes to generate.
+   *   (optional) The number of nodes to generate. Defaults to five.
    */
   function createSampleNodes($count = 5) {
     $langcode = LANGUAGE_NONE;
@@ -290,7 +307,7 @@ EOF;
 }
 
 /**
- * Tests aggregator configuration settings.
+ * Tests functionality of the configuration settings in the Aggregator module.
  */
 class AggregatorConfigurationTestCase extends AggregatorTestCase {
   public static function getInfo() {
@@ -321,6 +338,9 @@ class AggregatorConfigurationTestCase extends AggregatorTestCase {
   }
 }
 
+/**
+ * Tests adding aggregator feeds.
+ */
 class AddFeedTestCase extends AggregatorTestCase {
   public static function getInfo() {
     return array(
@@ -331,7 +351,7 @@ class AddFeedTestCase extends AggregatorTestCase {
   }
 
   /**
-   * Create a feed, ensure that it is unique, check the source, and delete the feed.
+   * Creates and ensures that a feed is unique, checks source, and deletes feed.
    */
   function testAddFeed() {
     $feed = $this->createFeed();
@@ -381,6 +401,9 @@ class AddFeedTestCase extends AggregatorTestCase {
   }
 }
 
+/**
+ * Tests the categorize feed functionality in the Aggregator module.
+ */
 class CategorizeFeedTestCase extends AggregatorTestCase {
   public static function getInfo() {
     return array(
@@ -391,7 +414,7 @@ class CategorizeFeedTestCase extends AggregatorTestCase {
   }
 
   /**
-   * Create a feed and make sure you can add more than one category to it.
+   * Creates a feed and makes sure you can add more than one category to it.
    */
   function testCategorizeFeed() {
 
@@ -424,6 +447,9 @@ class CategorizeFeedTestCase extends AggregatorTestCase {
   }
 }
 
+/**
+ * Tests functionality of updating the feed in the Aggregator module.
+ */
 class UpdateFeedTestCase extends AggregatorTestCase {
   public static function getInfo() {
     return array(
@@ -434,7 +460,7 @@ class UpdateFeedTestCase extends AggregatorTestCase {
   }
 
   /**
-   * Create a feed and attempt to update it.
+   * Creates a feed and attempts to update it.
    */
   function testUpdateFeed() {
     $remamining_fields = array('title', 'url', '');
@@ -466,6 +492,9 @@ class UpdateFeedTestCase extends AggregatorTestCase {
   }
 }
 
+/**
+ * Tests functionality for removing feeds in the Aggregator module.
+ */
 class RemoveFeedTestCase extends AggregatorTestCase {
   public static function getInfo() {
     return array(
@@ -476,7 +505,7 @@ class RemoveFeedTestCase extends AggregatorTestCase {
   }
 
   /**
-   * Remove a feed and ensure that all it services are removed.
+   * Removes a feed and ensures that all of its services are removed.
    */
   function testRemoveFeed() {
     $feed = $this->createFeed();
@@ -494,6 +523,9 @@ class RemoveFeedTestCase extends AggregatorTestCase {
   }
 }
 
+/**
+ * Tests functionality of updating a feed item in the Aggregator module.
+ */
 class UpdateFeedItemTestCase extends AggregatorTestCase {
   public static function getInfo() {
     return array(
@@ -504,7 +536,7 @@ class UpdateFeedItemTestCase extends AggregatorTestCase {
   }
 
   /**
-   * Test running "update items" from the 'admin/config/services/aggregator' page.
+   * Tests running "update items" from 'admin/config/services/aggregator' page.
    */
   function testUpdateFeedItem() {
     $this->createSampleNodes();
@@ -564,7 +596,7 @@ class RemoveFeedItemTestCase extends AggregatorTestCase {
   }
 
   /**
-   * Test running "remove items" from the 'admin/config/services/aggregator' page.
+   * Tests running "remove items" from 'admin/config/services/aggregator' page.
    */
   function testRemoveFeedItem() {
     // Create a bunch of test feeds.
@@ -592,6 +624,9 @@ class RemoveFeedItemTestCase extends AggregatorTestCase {
   }
 }
 
+/**
+ * Tests categorization functionality in the Aggregator module.
+ */
 class CategorizeFeedItemTestCase extends AggregatorTestCase {
   public static function getInfo() {
     return array(
@@ -602,6 +637,8 @@ class CategorizeFeedItemTestCase extends AggregatorTestCase {
   }
 
   /**
+   * Checks that children of a feed inherit a defined category.
+   *
    * If a feed has a category, make sure that the children inherit that
    * categorization.
    */
@@ -649,6 +686,9 @@ class CategorizeFeedItemTestCase extends AggregatorTestCase {
   }
 }
 
+/**
+ * Tests importing feeds from OPML functionality for the Aggregator module.
+ */
 class ImportOPMLTestCase extends AggregatorTestCase {
   public static function getInfo() {
     return array(
@@ -659,7 +699,7 @@ class ImportOPMLTestCase extends AggregatorTestCase {
   }
 
   /**
-   * Open OPML import form.
+   * Opens OPML import form.
    */
   function openImportForm() {
     db_delete('aggregator_category')->execute();
@@ -681,7 +721,7 @@ class ImportOPMLTestCase extends AggregatorTestCase {
   }
 
   /**
-   * Submit form filled with invalid fields.
+   * Submits form filled with invalid fields.
    */
   function validateImportFormFields() {
     $before = db_query('SELECT COUNT(*) FROM {aggregator_feed}')->fetchField();
@@ -707,7 +747,7 @@ class ImportOPMLTestCase extends AggregatorTestCase {
   }
 
   /**
-   * Submit form with invalid, empty and valid OPML files.
+   * Submits form with invalid, empty, and valid OPML files.
    */
   function submitImportForm() {
     $before = db_query('SELECT COUNT(*) FROM {aggregator_feed}')->fetchField();
@@ -766,6 +806,9 @@ class ImportOPMLTestCase extends AggregatorTestCase {
     $this->assertTrue($category, 'Categories are correct.');
   }
 
+  /**
+   * Tests the import of an OPML file.
+   */
   function testOPMLImport() {
     $this->openImportForm();
     $this->validateImportFormFields();
@@ -773,6 +816,9 @@ class ImportOPMLTestCase extends AggregatorTestCase {
   }
 }
 
+/**
+ * Tests functionality of the cron process in the Aggregator module.
+ */
 class AggregatorCronTestCase extends AggregatorTestCase {
   public static function getInfo() {
     return array(
@@ -783,7 +829,7 @@ class AggregatorCronTestCase extends AggregatorTestCase {
   }
 
   /**
-   * Add feeds update them on cron.
+   * Adds feeds and updates them via cron process.
    */
   public function testCron() {
     // Create feed and test basic updating on cron.
@@ -819,6 +865,9 @@ class AggregatorCronTestCase extends AggregatorTestCase {
   }
 }
 
+/**
+ * Tests rendering functionality in the Aggregator module.
+ */
 class AggregatorRenderingTestCase extends AggregatorTestCase {
   public static function getInfo() {
     return array(
@@ -829,9 +878,9 @@ class AggregatorRenderingTestCase extends AggregatorTestCase {
   }
 
   /**
-   * Add a feed block to the page and checks its links.
+   * Adds a feed block to the page and checks its links.
    *
-   * TODO: Test the category block as well.
+   * @todo Test the category block as well.
    */
   public function testBlockLinks() {
     // Create feed.
@@ -890,7 +939,7 @@ class AggregatorRenderingTestCase extends AggregatorTestCase {
   }
 
   /**
-   * Create a feed and check that feed's page.
+   * Creates a feed and checks that feed's page.
    */
   public function testFeedPage() {
     // Increase the number of items published in the rss.xml feed so we have
@@ -913,7 +962,7 @@ class AggregatorRenderingTestCase extends AggregatorTestCase {
 }
 
 /**
- * Tests for feed parsing.
+ * Tests feed parsing in the Aggregator module.
  */
 class FeedParserTestCase extends AggregatorTestCase {
   public static function getInfo() {
@@ -933,7 +982,7 @@ class FeedParserTestCase extends AggregatorTestCase {
   }
 
   /**
-   * Test a feed that uses the RSS 0.91 format.
+   * Tests a feed that uses the RSS 0.91 format.
    */
   function testRSS091Sample() {
     $feed = $this->createFeed($this->getRSS091Sample());
@@ -955,7 +1004,7 @@ class FeedParserTestCase extends AggregatorTestCase {
   }
 
   /**
-   * Test a feed that uses the Atom format.
+   * Tests a feed that uses the Atom format.
    */
   function testAtomSample() {
     $feed = $this->createFeed($this->getAtomSample());