diff --git a/core/modules/dblog/dblog-rtl.css b/core/modules/dblog/dblog-rtl.css
index 51dcf7a..0fab8d0 100644
--- a/core/modules/dblog/dblog-rtl.css
+++ b/core/modules/dblog/dblog-rtl.css
@@ -1,6 +1,6 @@
 /**
  * @file
- * RTL styling for the Database Logging module.
+ * Right-to-Left styling for the Database Logging module.
  */
 
 .form-item-type,
diff --git a/core/modules/dblog/dblog.admin.inc b/core/modules/dblog/dblog.admin.inc
index 012d01e..328b2d2 100644
--- a/core/modules/dblog/dblog.admin.inc
+++ b/core/modules/dblog/dblog.admin.inc
@@ -8,11 +8,13 @@
 /**
  * Page callback: Displays a listing of database log messages.
  *
- * Messages are truncated at 56 chars. Full-length messages can be viewed on
- * the message details page.
+ * Messages are truncated at 56 chars. Full-length messages can be viewed on the
+ * message details page.
  *
- * @see dblog_menu()
+ * @see dblog_clear_log_form()
  * @see dblog_event()
+ * @see dblog_filter_form()
+ * @see dblog_menu()
  */
 function dblog_overview() {
   $filter = dblog_build_filter_query();
@@ -92,6 +94,9 @@ function dblog_overview() {
  * @param string $type
  *   Type of database log events to display (e.g., 'search').
  *
+ * @return array
+ *   A build array in the format expected by drupal_render().
+ *
  * @see dblog_menu()
  */
 function dblog_top($type) {
@@ -140,6 +145,10 @@ function dblog_top($type) {
  * @param int $id
  *   Unique ID of the database log message.
  *
+ * @return array|string
+ *   If the $id is located in the Database Logging table, a build array in the
+ *   format expected by drupal_render(); otherwise, an empty string.
+ *
  * @see dblog_menu()
  */
 function dblog_event($id) {
@@ -301,6 +310,8 @@ function theme_dblog_message($variables) {
  *
  * @see dblog_filter_form_validate()
  * @see dblog_filter_form_submit()
+ * @see dblog_overview()
+ *
  * @ingroup forms
  */
 function dblog_filter_form($form) {
diff --git a/core/modules/dblog/dblog.module b/core/modules/dblog/dblog.module
index 2e8422f..89efb57 100644
--- a/core/modules/dblog/dblog.module
+++ b/core/modules/dblog/dblog.module
@@ -1,7 +1,5 @@
 <?php
 
-use Drupal\Core\Database\Database;
-
 /**
  * @file
  * System monitoring and logging for administrators.
@@ -13,6 +11,8 @@
  * @see watchdog()
  */
 
+use Drupal\Core\Database\Database;
+
 /**
  * Implements hook_help().
  */
diff --git a/core/modules/dblog/lib/Drupal/dblog/Tests/DBLogTest.php b/core/modules/dblog/lib/Drupal/dblog/Tests/DBLogTest.php
index 2e6bb50..3c7f7e4 100644
--- a/core/modules/dblog/lib/Drupal/dblog/Tests/DBLogTest.php
+++ b/core/modules/dblog/lib/Drupal/dblog/Tests/DBLogTest.php
@@ -22,9 +22,25 @@ class DBLogTest extends WebTestBase {
    */
   public static $modules = array('dblog', 'poll');
 
+  /**
+   * The installation to use with this test.
+   *
+   * @var string
+   */
   protected $profile = 'standard';
 
+  /**
+   * A user with some relevent administrative permissions.
+   *
+   * @var object
+   */
   protected $big_user;
+
+  /**
+   * A user without any permissions.
+   *
+   * @var object
+   */
   protected $any_user;
 
   public static function getInfo() {
@@ -110,9 +126,9 @@ private function verifyCron($row_limit) {
    * @param int $count
    *   Number of watchdog entries to generate.
    * @param string $type
-   *   The type of watchdog entry.
+   *   (optional) The type of watchdog entry. Defaults to 'custom'.
    * @param int $severity
-   *   The severity of the watchdog entry.
+   *   (optional) The severity of the watchdog entry. Defaults to WATCHDOG_NOTICE.
    */
   private function generateLogEntries($count, $type = 'custom', $severity = WATCHDOG_NOTICE) {
     global $base_root;
@@ -142,7 +158,7 @@ private function generateLogEntries($count, $type = 'custom', $severity = WATCHD
    * Confirms that database log reports are displayed at the correct paths.
    *
    * @param int $response
-   *   HTTP response code.
+   *   (optional) HTTP response code. Defaults to 200.
    */
   private function verifyReports($response = 200) {
     $quote = '&#039;';