diff --git a/core/lib/Drupal/Core/Extension/ThemeHandler.php b/core/lib/Drupal/Core/Extension/ThemeHandler.php
index 957417c..9f40fa4 100644
--- a/core/lib/Drupal/Core/Extension/ThemeHandler.php
+++ b/core/lib/Drupal/Core/Extension/ThemeHandler.php
@@ -172,6 +172,8 @@ public function setDefault($name) {
    * {@inheritdoc}
    */
   public function install(array $theme_list, $install_dependencies = TRUE) {
+    // We keep the old install() method as BC layer but redirect directly to the
+    // theme installer.
     \Drupal::service('theme_installer')->install($theme_list, $install_dependencies);
   }
 
@@ -179,6 +181,8 @@ public function install(array $theme_list, $install_dependencies = TRUE) {
    * {@inheritdoc}
    */
   public function uninstall(array $theme_list) {
+    // We keep the old uninstall() method as BC layer but redirect directly to
+    // the theme installer.
     \Drupal::service('theme_installer')->uninstall($theme_list);
   }