diff --git a/core/composer.json b/core/composer.json
index 5210ed6..dde4d9c 100644
--- a/core/composer.json
+++ b/core/composer.json
@@ -150,8 +150,8 @@
   "scripts": {
     "pre-autoload-dump": "Drupal\\Core\\Composer\\Composer::preAutoloadDump",
     "post-autoload-dump": [
-      "Drupal\\Core\\Composer\\Composer::ensureHtaccess",
-      "Drupal\\Core\\Composer\\Composer::dumpDeploymentIdentifier"
+      "Drupal\\Core\\Composer\\Composer::dumpDeploymentIdentifier",
+      "Drupal\\Core\\Composer\\Composer::ensureHtaccess"
     ]
   }
 }
diff --git a/core/lib/Drupal/Core/Composer/Composer.php b/core/lib/Drupal/Core/Composer/Composer.php
index 2f997eb..c901f56 100644
--- a/core/lib/Drupal/Core/Composer/Composer.php
+++ b/core/lib/Drupal/Core/Composer/Composer.php
@@ -76,6 +76,10 @@ public static function ensureHtaccess(Event $event) {
   /**
    * Generates the DeploymentIdentifier class.
    *
+   * This class has a method that will return an ID that matches a particular
+   * Composer installation. It is used to ensure that PHP opcode caches will be
+   * invalidated whenever the Composer dependencies change.
+   *
    * @param \Composer\Script\Event $event
    */
   public static function dumpDeploymentIdentifier(Event $event) {
@@ -85,17 +89,22 @@ public static function dumpDeploymentIdentifier(Event $event) {
     $lines = <<<EOT
 <?php
 
+/**
+ * @file
+ * Contains \Drupal\Core\Composer\DeploymentIdentifier.
+ */
+
 namespace Drupal\Core\Composer;
 
 /**
  * Provides the deployment identifier created by Composer.
  *
- * @see
+ * @see \Drupal\Core\Composer\Composer::dumpDeploymentIdentifier().
  */
 class DeploymentIdentifier implements DeploymentIdentifierInterface {
 
   /**
-   * @return string
+   * {@inheritdoc}
    */
   public function getIdentifier() {
     return '$hash';
diff --git a/core/lib/Drupal/Core/Composer/DeploymentIdentifierInterface.php b/core/lib/Drupal/Core/Composer/DeploymentIdentifierInterface.php
index 22a7f82..760294e 100644
--- a/core/lib/Drupal/Core/Composer/DeploymentIdentifierInterface.php
+++ b/core/lib/Drupal/Core/Composer/DeploymentIdentifierInterface.php
@@ -18,6 +18,7 @@
    * Returns the deployment identifier.
    *
    * @return string
+   *   The identifier.
    */
   public function getIdentifier();
 
diff --git a/core/vendor/DeploymentIdentifier.php b/core/vendor/DeploymentIdentifier.php
index 369df13..afa5455 100644
--- a/core/vendor/DeploymentIdentifier.php
+++ b/core/vendor/DeploymentIdentifier.php
@@ -1,16 +1,21 @@
 <?php
 
+/**
+ * @file
+ * Contains \Drupal\Core\Composer\DeploymentIdentifier.
+ */
+
 namespace Drupal\Core\Composer;
 
 /**
  * Provides the deployment identifier created by Composer.
  *
- * @see
+ * @see \Drupal\Core\Composer\Composer::dumpDeploymentIdentifier().
  */
 class DeploymentIdentifier implements DeploymentIdentifierInterface {
 
   /**
-   * @return string
+   * {@inheritdoc}
    */
   public function getIdentifier() {
     return 'e6a3c80757f0e2a34ecc1cb9332cdab1';