diff --git a/core/modules/system/lib/Drupal/system/Form/DateFormatDeleteForm.php b/core/modules/system/lib/Drupal/system/Form/DateFormatDeleteForm.php
index cf20038..bbbcee6 100644
--- a/core/modules/system/lib/Drupal/system/Form/DateFormatDeleteForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/DateFormatDeleteForm.php
@@ -87,6 +87,8 @@ protected function getCancelPath() {
 
   /**
    * {@inheritdoc}
+   * @param string $format_id
+   *   The date format ID.
    */
   public function buildForm(array $form, array &$form_state, $format_id = NULL) {
     // We don't get the format ID in the returned format array.
diff --git a/core/modules/system/lib/Drupal/system/Form/DateFormatLocalizeResetForm.php b/core/modules/system/lib/Drupal/system/Form/DateFormatLocalizeResetForm.php
index 067f9f5..5441173 100644
--- a/core/modules/system/lib/Drupal/system/Form/DateFormatLocalizeResetForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/DateFormatLocalizeResetForm.php
@@ -86,6 +86,9 @@ protected function getDescription() {
 
   /**
    * {@inheritdoc}
+   * @param string $langcode
+   *   The language code.
+   *
    */
   public function buildForm(array $form, array &$form_state, $langcode = NULL) {
     $this->language = language_load($langcode);
diff --git a/core/modules/system/lib/Drupal/system/Form/ModulesInstallConfirmForm.php b/core/modules/system/lib/Drupal/system/Form/ModulesInstallConfirmForm.php
index 0bace16..2569161 100644
--- a/core/modules/system/lib/Drupal/system/Form/ModulesInstallConfirmForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/ModulesInstallConfirmForm.php
@@ -53,6 +53,10 @@ public function getFormID() {
 
   /**
    * {@inheritdoc}
+   * @param array $modules
+   *   The array of modules.
+   * @param array $storage
+   *   Temporary storage of module dependency information.
    */
   public function buildForm(array $form, array &$form_state, $modules = array(), $storage = array()) {
     $items = array();
diff --git a/core/modules/system/lib/Drupal/system/Form/ModulesUninstallConfirmForm.php b/core/modules/system/lib/Drupal/system/Form/ModulesUninstallConfirmForm.php
index 1db1ce2..8c3a3a6 100644
--- a/core/modules/system/lib/Drupal/system/Form/ModulesUninstallConfirmForm.php
+++ b/core/modules/system/lib/Drupal/system/Form/ModulesUninstallConfirmForm.php
@@ -53,6 +53,8 @@ public function getFormID() {
 
   /**
    * {@inheritdoc}
+   * @param array $modules
+   *   The array of modules.
    */
   public function buildForm(array $form, array &$form_state, $modules = array()) {
     $uninstall = array();