diff --git a/modules/statistics/statistics.admin.inc b/modules/statistics/statistics.admin.inc
index 6606b8b..1fc1855 100644
--- a/modules/statistics/statistics.admin.inc
+++ b/modules/statistics/statistics.admin.inc
@@ -6,7 +6,15 @@
  */

 /**
- * Menu callback; presents the "recent hits" page.
+ * Displays recent page accesses. This is a menu callback.
+ *
+ * This is a menu callback to display the pages with recent hits.
+ * The time interval used is the statistics_flush_accesslog_timer.
+ * This set on the statistics settings form.
+ *
+ * @return array $build
+ *   Returns an associative array that can be rendered with information about
+ *   the most recent hits.
  */
 function statistics_recent_hits() {
   $header = array(
@@ -47,6 +55,17 @@ function statistics_recent_hits() {
 /**
  * Menu callback; presents the "top pages" page.
  */
+/**
+ * Displays statistices for the "top pages" accesses. This is a menu callback.
+ *
+ *  This is a menu callback to display the pages with the most hits (the "top
+ * pages"). The time interval used is the statistics_flush_accesslog_timer.
+ * This set on the statistics settings form.
+ *
+ * @return array $build
+ *   Returns an associative array with the top pages information; this array
+ *   can be rendered.
+ */
 function statistics_top_pages() {
   $header = array(
     array('data' => t('Hits'), 'field' => 'hits', 'sort' => 'desc'),
@@ -90,7 +109,15 @@ function statistics_top_pages() {
 }

 /**
- * Menu callback; presents the "top visitors" page.
+ * Displays the "top visitors" page. This is a menu callback.
+ *
+ * This is a menu callback to display the top visitors. The time interval
+ * used is the statistics_flush_accesslog_timer.  This set on the statistics
+ * settings form.
+ *
+ * @return array $build
+ *   Returns an associative array with the top visitors information. This array
+ *   can be rendered.
  */
 function statistics_top_visitors() {

@@ -143,7 +170,15 @@ function statistics_top_visitors() {
 }

 /**
- * Menu callback; presents the "referrer" page.
+ * Displays the top referrers in the access logs. This is a menu callback.
+ *
+ * This is a menu callback to display the "referrer" page. The time interval
+ * used is the statistics_flush_accesslog_timer.  This set on the statistics
+ * settings form.
+ *
+ * @return array $build
+ *   Returns an associative array with the top referrers information. This
+ *   array can be rendered .
  */
 function statistics_top_referrers() {
   drupal_set_title(t('Top referrers in the past %interval', array('%interval' => format_interval(variable_get('statistics_flush_accesslog_timer', 259200)))), PASS_THROUGH);
@@ -189,7 +224,12 @@ function statistics_top_referrers() {
 }

 /**
- * Menu callback; Displays recent page accesses.
+  * Displays recent page accesses. This is a menu callback.
+ *
+ * @return array $build | drupal_not_found()
+ *   Returns an associative array with the page access statistics that can be
+ *   rendered.  If information for the page was not found, returns
+ *   drupal_not_found().
  */
 function statistics_access_log($aid) {
   $access = db_query('SELECT a.*, u.name FROM {accesslog} a LEFT JOIN {users} u ON a.uid = u.uid WHERE aid = :aid', array(':aid' => $aid))->fetch();
@@ -233,7 +273,14 @@ function statistics_access_log($aid) {
 }

 /**
- * Form builder; Configure access logging.
+ * Form settings for the statistics administration form.
+ *
+ * Adds form elements for the statistics administration form, including
+ * settings for the statistics access log.
+ *
+ * @return array $form
+ *   Returns an associative array containing the structure of the statistics
+ *   settings form.
  *
  * @ingroup forms
  * @see system_settings_form()
diff --git a/modules/statistics/statistics.install b/modules/statistics/statistics.install
index a5dc7f8..44b6bf4 100644
--- a/modules/statistics/statistics.install
+++ b/modules/statistics/statistics.install
@@ -21,6 +21,9 @@ function statistics_uninstall() {

 /**
  * Implements hook_schema().
+ *
+ * @return array $schema
+ *   Returns the associative array with the schema information.
  */
 function statistics_schema() {
   $schema['accesslog'] = array(
diff --git a/modules/statistics/statistics.module b/modules/statistics/statistics.module
index 0ba9d7f..e31e534 100644
--- a/modules/statistics/statistics.module
+++ b/modules/statistics/statistics.module
@@ -2,11 +2,14 @@

 /**
  * @file
- * Logs access statistics for your site.
+ * Logs and displays access statistics for a site.
  */

 /**
  * Implements hook_help().
+ *
+ * @return string
+ *   Returns HTML with help info.
  */
 function statistics_help($path, $arg) {
   switch ($path) {
@@ -45,7 +48,7 @@ function statistics_help($path, $arg) {
 /**
  * Implements hook_exit().
  *
- * This is where statistics are gathered on page accesses.
+ * Gathers statistics for page accesses.
  */
 function statistics_exit() {
   global $user;
@@ -129,6 +132,9 @@ function statistics_node_view($node, $view_mode) {

 /**
  * Implements hook_menu().
+ *
+ * @return array $item
+ *   Returns the associative array $item that has menu items and callback info.
  */
 function statistics_menu() {
   $items['admin/reports/hits'] = array(
@@ -246,15 +252,14 @@ function statistics_cron() {
 }

 /**
- * Returns all time or today top or last viewed node(s).
+ * Returns top viewed content of all time, for today, or the last viewed node.
  *
- * @param $dbfield
+ * @param string $dbfield
  *   one of
  *   - 'totalcount': top viewed content of all time.
  *   - 'daycount': top viewed content for today.
  *   - 'timestamp': last viewed node.
- *
- * @param $dbrows
+ * @param int $dbrows
  *   number of rows to be returned.
  *
  * @return
@@ -371,8 +376,15 @@ function statistics_block_view($delta = '') {
 }

 /**
- * It is possible to adjust the width of columns generated by the
- * statistics module.
+ * Generates a link to a path, truncating the displayed text to a given width.
+ *
+ * @param string $path
+ *   The path to generate the link for
+ * @param int | 35
+ *   The width to set the displayed text of the path
+ *
+ * @return link
+ *   Returns the text truncated to the width, linked to the given $path.
  */
 function _statistics_link($path, $width = 35) {
   $title = drupal_get_path_alias($path);
@@ -380,6 +392,17 @@ function _statistics_link($path, $width = 35) {
   return l($title, $path);
 }

+/**
+ * Create a link for text to a path, truncating width of the text if needed.
+ * *
+ * @param string $title
+ *   The text to link to a path; will be truncated to a max width of 35.
+ * @param string $path | '/'
+ *   The path to link to; will default to '/'.
+ *
+ * @return string $output
+ *   Returns the HTML with $title linked to the $path.
+ */
 function _statistics_format_item($title, $path) {
   $path = ($path ? $path : '/');
   $output  = ($title ? "$title<br />" : '');
diff --git a/modules/statistics/statistics.pages.inc b/modules/statistics/statistics.pages.inc
index bb31f98..4b5f7c9 100644
--- a/modules/statistics/statistics.pages.inc
+++ b/modules/statistics/statistics.pages.inc
@@ -5,6 +5,14 @@
  * User page callbacks for the statistics module.
  */

+/**
+ * Displays statistics for a node. This is a menu callback.
+ *
+ * @return array $build | drupal_not_found()
+ *   Returns $build, an associative array containing node statistics. This
+ *   associative array can be rendered. If information for the node was not
+ *   found, this will deliver a page not found error via drupal_not_found().
+ */
 function statistics_node_tracker() {
   if ($node = node_load(arg(1))) {

@@ -52,6 +60,14 @@ function statistics_node_tracker() {
   }
 }

+/**
+ * Displays statistics for a user. This is a menu callback.
+ *
+ * @return array $build | drupal_not_found()
+ *   Returns $build, an associative array containing user statistics. This
+ *   associative array can be rendered. If information for the user was not
+ *   found, this will deliver a page not found error via drupal_not_found().
+ */
 function statistics_user_tracker() {
   if ($account = user_load(arg(1))) {

diff --git a/modules/statistics/statistics.test b/modules/statistics/statistics.test
index 126828f..4cd61eb 100644
--- a/modules/statistics/statistics.test
+++ b/modules/statistics/statistics.test
@@ -2,14 +2,19 @@

 /**
  * @file
- * Tests for statistics.module.
+ * Tests for the statistics module.
  */

 /**
- * Sets up a base class for the Statistics module.
+ * Sets up a base class for testing the statistics module.
  */
 class StatisticsTestCase extends DrupalWebTestCase {

+  /**
+   * Set up the test class; initialize data needed for testing.
+   *
+   * @see DrupalWebTestCase::setUp()
+   */
   function setUp() {
     parent::setUp('statistics');

@@ -48,10 +53,13 @@ class StatisticsTestCase extends DrupalWebTestCase {
 /**
  * Tests that logging via statistics_exit() works for cached and uncached pages.
  *
- * Subclass DrupalWebTestCase rather than StatisticsTestCase, because we want
- * to test requests from an anonymous user.
+ * We subclass DrupalWebTestCase rather than StatisticsTestCase, because we
+ * want to test requests from an anonymous user.
  */
 class StatisticsLoggingTestCase extends DrupalWebTestCase {
+  /**
+   * Return the name, description, and group info for this test case.
+   */
   public static function getInfo() {
     return array(
       'name' => 'Statistics logging tests',
@@ -60,6 +68,11 @@ class StatisticsLoggingTestCase extends DrupalWebTestCase {
     );
   }

+  /**
+   * Set up the test class; initialize data needed for testing.
+   *
+   * @see DrupalWebTestCase::setUp()
+   */
   function setUp() {
     parent::setUp('statistics');

@@ -123,6 +136,9 @@ class StatisticsLoggingTestCase extends DrupalWebTestCase {
  * Tests that report pages render properly, and that access logging works.
  */
 class StatisticsReportsTestCase extends StatisticsTestCase {
+  /**
+   * Return the name, description, and group info for this test case.
+   */
   public static function getInfo() {
     return array(
       'name' => 'Statistics reports tests',
@@ -210,9 +226,12 @@ class StatisticsReportsTestCase extends StatisticsTestCase {
 }

 /**
- * Tests that the visitor blocking functionality works.
+ * Tests that visitor blocking functionality works.
  */
 class StatisticsBlockVisitorsTestCase extends StatisticsTestCase {
+  /**
+   * Return the name, description, and group info for this test case.
+   */
   public static function getInfo() {
     return array(
       'name' => 'Top visitor blocking',
@@ -260,12 +279,27 @@ class StatisticsBlockVisitorsTestCase extends StatisticsTestCase {
 }

 /**
- * Test statistics administration screen.
+ * Tests the statistics administration screen.
  */
 class StatisticsAdminTestCase extends DrupalWebTestCase {
+
+  /**
+   * A user that has permissions necessary to administer and access statistics.
+   *
+   * @var A fully-loaded $user object or FALSE if user creation failed.
+   */
   protected $privileged_user;
+
+  /**
+   * A page (node) to access and then verify the access statistics for it.
+   *
+   * @var node
+   */
   protected $test_node;

+  /**
+   * Return the name, description, and group info for this test case.
+   */
   public static function getInfo() {
     return array(
       'name' => 'Test statistics admin.',
@@ -274,6 +308,11 @@ class StatisticsAdminTestCase extends DrupalWebTestCase {
     );
   }

+  /**
+   * Set up the test class; initialize data needed for testing.
+   *
+   * @see DrupalWebTestCase::setUp()
+   */
   function setUp() {
     parent::setUp('statistics');
     $this->privileged_user = $this->drupalCreateUser(array('access statistics', 'administer statistics', 'view post access counter', 'create page content'));
@@ -403,6 +442,9 @@ class StatisticsAdminTestCase extends DrupalWebTestCase {
  * Test statistics token replacement in strings.
  */
 class StatisticsTokenReplaceTestCase extends StatisticsTestCase {
+  /**
+   * Return the name, description, and group info for this test case.
+   */
   public static function getInfo() {
     return array(
       'name' => 'Statistics token replacement',