diff -u b/config_update_ui/config_update_ui.drush.inc b/config_update_ui/config_update_ui.drush.inc
--- b/config_update_ui/config_update_ui.drush.inc
+++ b/config_update_ui/config_update_ui.drush.inc
@@ -2,9 +2,11 @@
 
 /**
  * @file
- * Drush commands for the Configuration Update Reports module.
+ * Drush 8 commands for the Configuration Update Reports module.
  */
 
+use Drupal\config_update_ui\Logger\ConfigUpdateUiDrush8Logger;
+
 /**
  * Implements hook_drush_command().
  */
@@ -258,12 +260,12 @@
 }
 
 /**
- * Bootstraps the Drush Commands CLI service and set the logger to Drush 8.
+ * Instantiates and returns the Drush Commands CLI service for Drush 8.
  */
 function drush_config_update_ui_cli_service() {
   /** @var \Drupal\config_update_ui\ConfigUpdateUiCliService $config_update_ui_service */
   $config_update_ui_service = \Drupal::service('config_update_ui.cli');
-  $logger = \Drupal::service('logger.config_update_ui.drush8');
+  $logger = new ConfigUpdateUiDrush8Logger(\Drupal::service('logger.log_message_parser'));
   $config_update_ui_service->setLogger($logger);
 
   return $config_update_ui_service;
diff -u b/config_update_ui/config_update_ui.services.yml b/config_update_ui/config_update_ui.services.yml
--- b/config_update_ui/config_update_ui.services.yml
+++ b/config_update_ui/config_update_ui.services.yml
@@ -4,6 +4 @@
-    arguments: ['@entity.manager', '@config_update.config_diff', '@config_update.config_list', '@config_update.config_update']
-  logger.config_update_ui.drush8:
-    class: Drupal\config_update_ui\Logger\ConfigUpdateUiDrush8Logger
-    arguments: ['@logger.log_message_parser']
-    tags:
-      - { name: logger }
+    arguments: ['@entity_type.manager', '@config_update.config_diff', '@config_update.config_list', '@config_update.config_update']
diff -u b/config_update_ui/src/Commands/ConfigUpdateUiCommands.php b/config_update_ui/src/Commands/ConfigUpdateUiCommands.php
--- b/config_update_ui/src/Commands/ConfigUpdateUiCommands.php
+++ b/config_update_ui/src/Commands/ConfigUpdateUiCommands.php
@@ -21,7 +21,7 @@
   protected $cliService;
 
   /**
-   * ConfigUpdateUiCommands constructor.
+   * Constructs a ConfigUpdateUiCommands object.
    *
    * @param \Drupal\config_update_ui\ConfigUpdateUiCliService $cliService
    *   The CLI service which allows interoperability between Drush versions.
diff -u b/config_update_ui/src/ConfigUpdateUiCliService.php b/config_update_ui/src/ConfigUpdateUiCliService.php
--- b/config_update_ui/src/ConfigUpdateUiCliService.php
+++ b/config_update_ui/src/ConfigUpdateUiCliService.php
@@ -11,15 +11,18 @@
 use Psr\Log\LoggerInterface;
 
 /**
- * Class ConfigUpdateUiCliService.
+ * Handles all the logic for commands for various versions of Drush.
  *
- * This class handles all the logic for Drush commands.
+ * To use this class, you must call the
+ * \Drupal\config_update_ui\ConfigUpdateUiCliService::setLogger() method before
+ * doing anything else.
  */
 class ConfigUpdateUiCliService {
+
   /**
    * The entity manager.
    *
-   * @var \Drupal\Core\Entity\EntityManagerInterface
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
    */
   protected $entityManager;
 
@@ -38,7 +41,7 @@
   protected $configList;
 
   /**
-   * The config updater.
+   * The config reverter.
    *
    * @var \Drupal\config_update\ConfigReverter
    */
@@ -49,12 +52,21 @@
    *
    * This differs between Drush version 8 and 9.
    *
-   * @var \Drush\Log\Logger|ConfigUpdateUiDrush8Logger
+   * @var \Drush\Log\Logger|\Drupal\config_update_ui\ConfigUpdateUiDrush8Logger
    */
   protected $logger;
 
   /**
-   * Constructor.
+   * Constructs a ConfigUpdateUiCliService object.
+   *
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entityManager
+   *   The entity type manager.
+   * @param \Drupal\config_update\ConfigDiffer $configDiff
+   *   The config differ.
+   * @param \Drupal\config_update\ConfigListerWithProviders $configList
+   *   The config lister.
+   * @param \Drupal\config_update\ConfigReverter $configUpdate
+   *   The config reverter.
    */
   public function __construct(EntityTypeManagerInterface $entityManager, ConfigDiffer $configDiff, ConfigListerWithProviders $configList, ConfigReverter $configUpdate) {
     $this->entityManager = $entityManager;
@@ -298,10 +310,12 @@
   }
 
   /**
-   * Associates a logging object.
+   * Registers a logger.
    *
    * @param \Psr\Log\LoggerInterface $logger
-   *   The logging object.
+   *   The logging object to use. For Drush 8, you must use an object of class
+   *   \Drupal\config_ui\ConfigUpdateUiDrush8Logger. For Drush 9 and later,
+   *   use the output of \Drush\Drush::logger().
    */
   public function setLogger(LoggerInterface $logger) {
     $this->logger = $logger;
@@ -320,7 +334,7 @@
   /**
    * Lists differing config items.
    *
-   * Lists config items that differ from the versions provided by your 
+   * Lists config items that differ from the versions provided by your
    * installed modules, themes, or install profile. See config-diff to show
    * what the differences are.
    *
@@ -335,7 +349,7 @@
    * @return array
    *   An array of differing configuration items.
    */
-  private function getDifferentItems($type, $name) {
+  protected function getDifferentItems($type, $name) {
     list($activeList, $installList, $optionalList) = $this->configList->listConfig($type, $name);
     $addedItems = array_diff($activeList, $installList, $optionalList);
     $activeAndAddedItems = array_diff($activeList, $addedItems);
@@ -363,7 +377,7 @@
    * @return string
    *   The shortname for the configuration item.
    */
-  private function getConfigShortname($type, $name) {
+  protected function getConfigShortname($type, $name) {
     $shortname = $name;
     if ($type != 'system.simple') {
       $definition = $this->entityManager->getDefinition($type);
@@ -389,7 +403,7 @@
    *   If using Drush 8, an array of strings. If using Drush 9, a structured
    *   data object of rows strings.
    */
-  private function outputRows(array $output) {
+  protected function outputRows(array $output) {
     if (get_class($this->logger) === 'ConfigUpdateUiDrush8Logger') {
       return $output;
     }
diff -u b/config_update_ui/src/Logger/ConfigUpdateUiDrush8Logger.php b/config_update_ui/src/Logger/ConfigUpdateUiDrush8Logger.php
--- b/config_update_ui/src/Logger/ConfigUpdateUiDrush8Logger.php
+++ b/config_update_ui/src/Logger/ConfigUpdateUiDrush8Logger.php
@@ -9,26 +9,25 @@
 use Drupal\Core\Logger\LogMessageParserInterface;
 
 /**
- * Class ConfigUpdateUiDrush8Logger.
- *
- * This is a stand-in for Psr\Log\LoggerInterface, which Drush 9 uses.
+ * Provides Drush 8 logging in a class.
  */
 class ConfigUpdateUiDrush8Logger implements LoggerInterface {
 
   use RfcLoggerTrait;
 
   /**
-   * The message's placeholders parser.
+   * The message placeholder parser.
    *
    * @var \Drupal\Core\Logger\LogMessageParserInterface
    */
   protected $parser;
 
   /**
-   * Constructs a SysLog object.
+   * Constructs a ConfigUpdateUiDrush8Logger object.
    *
    * @param \Drupal\Core\Logger\LogMessageParserInterface $parser
-   *   The parser to use when extracting message variables.
+   *   The parser to use when extracting message variables. The service
+   *   logger.log_message_parser is a good choice.
    */
   public function __construct(LogMessageParserInterface $parser) {
     $this->parser = $parser;
@@ -41,8 +40,8 @@
     // Translate the RFC logging levels into their Drush counterparts, more or
     // less.
     // @todo ALERT, CRITICAL and EMERGENCY are considered show-stopping errors,
-    // and they should cause Drush to exit or panic. Not sure how to handle this,
-    // though.
+    // and they should cause Drush to exit or panic. Not sure how to handle
+    // this, though.
     switch ($level) {
       case RfcLogLevel::ALERT:
       case RfcLogLevel::CRITICAL:
only in patch2:
unchanged:
--- a/config_update.services.yml
+++ b/config_update.services.yml
@@ -5,11 +5,11 @@ services:
 
   config_update.config_list:
     class: Drupal\config_update\ConfigListerWithProviders
-    arguments: ['@entity.manager', '@config.storage', '@config_update.extension_storage', '@config_update.extension_optional_storage', '@module_handler', '@theme_handler']
+    arguments: ['@entity_type.manager', '@config.storage', '@config_update.extension_storage', '@config_update.extension_optional_storage', '@module_handler', '@theme_handler']
 
   config_update.config_update:
     class: Drupal\config_update\ConfigReverter
-    arguments: ['@entity.manager', '@config.storage', '@config_update.extension_storage', '@config_update.extension_optional_storage', '@config.factory', '@event_dispatcher']
+    arguments: ['@entity_type.manager', '@config.storage', '@config_update.extension_storage', '@config_update.extension_optional_storage', '@config.factory', '@event_dispatcher']
 
   config_update.extension_storage:
     class: Drupal\Core\Config\ExtensionInstallStorage