diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/BlockRegion.php b/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/BlockRegion.php
index b28c6db..ed62183 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/BlockRegion.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/BlockRegion.php
@@ -20,18 +20,20 @@ class BlockRegion extends ProcessPluginBase {
   /**
    * {@inheritdoc}
    *
-   * Set the destination block region, based on the source region and theme as well as
-   * the current destination default theme.
+   * Set the destination block region, based on the source region and theme as well
+   * as the current destination default theme.
    */
   public function transform($value, MigrateExecutable $migrate_executable, Row $row, $destination_property) {
     list($region, $source_theme, $destination_theme) = $value;
 
-    // Theme is the same on both source and destination, we will assume they have the same regions.
+    // Theme is the same on both source and destination, we will assume they have
+    // the same regions.
     if (strtolower($source_theme) == strtolower($destination_theme)) {
       return $region;
     }
 
-    // If the source and destination theme are different, try to use the mappings defined in the configuration.
+    // If the source and destination theme are different, try to use the mappings
+    // defined in the configuration.
     $region_map = $this->configuration['region_map'];
     if (isset($region_map[$region])) {
       return $region_map[$region];
diff --git a/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/BlockTheme.php b/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/BlockTheme.php
index cf77da5..63c8551 100644
--- a/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/BlockTheme.php
+++ b/core/modules/migrate_drupal/src/Plugin/migrate/process/d6/BlockTheme.php
@@ -40,6 +40,8 @@ class BlockTheme extends ProcessPluginBase implements ContainerFactoryPluginInte
    *   The migration entity.
    * @param \Drupal\Core\Config\Config $config
    *   The configuration factory object.
+   * @param array $themes
+   *   The list of themes available on the destination.
    */
   public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, Config $config, array $themes) {
     parent::__construct($configuration, $plugin_id, $plugin_definition, $migration);
@@ -78,12 +80,14 @@ public function transform($value, MigrateExecutable $migrate_executable, Row $ro
     $d8_default_theme = $this->config->get('default');
     $d8_admin_theme = $this->config->get('admin');
 
-    // If the source block is assigned to a region in the source default theme, then assign it to the destination default theme.
+    // If the source block is assigned to a region in the source default theme,
+    // then assign it to the destination default theme.
     if (strtolower($theme) == strtolower($d6_default_theme)) {
       return $d8_default_theme;
     }
 
-    // If the source block is assigned to a region in the source admin theme, then assign it to the destination admin theme.
+    // If the source block is assigned to a region in the source admin theme,
+    // then assign it to the destination admin theme.
     if (strtolower($theme) == strtolower($d6_admin_theme)) {
       return $d8_admin_theme;
     }