diff --git a/src/Config/ConfigReadonlyStorage.php b/src/Config/ConfigReadonlyStorage.php
index bbd57ba..450c427 100644
--- a/src/Config/ConfigReadonlyStorage.php
+++ b/src/Config/ConfigReadonlyStorage.php
@@ -73,7 +73,7 @@ class ConfigReadonlyStorage extends CachedStorage {
   /**
    * {@inheritdoc}
    *
-   * @throws ConfigReadonlyStorageException
+   * @throws \Drupal\config_readonly\Exception\ConfigReadonlyStorageException
    */
   public function write($name, array $data) {
     $this->checkLock($name);
@@ -83,7 +83,7 @@ class ConfigReadonlyStorage extends CachedStorage {
   /**
    * {@inheritdoc}
    *
-   * @throws ConfigReadonlyStorageException
+   * @throws \Drupal\config_readonly\Exception\ConfigReadonlyStorageException
    */
   public function delete($name) {
     $this->checkLock($name);
@@ -93,7 +93,7 @@ class ConfigReadonlyStorage extends CachedStorage {
   /**
    * {@inheritdoc}
    *
-   * @throws ConfigReadonlyStorageException
+   * @throws \Drupal\config_readonly\Exception\ConfigReadonlyStorageException
    */
   public function rename($name, $new_name) {
     $this->checkLock($name);
@@ -104,7 +104,7 @@ class ConfigReadonlyStorage extends CachedStorage {
   /**
    * {@inheritdoc}
    *
-   * @throws ConfigReadonlyStorageException
+   * @throws \Drupal\config_readonly\Exception\ConfigReadonlyStorageException
    */
   public function deleteAll($prefix = '') {
     $this->checkLock();
@@ -115,7 +115,9 @@ class ConfigReadonlyStorage extends CachedStorage {
    * Check whether config is currently locked.
    *
    * @param string $name
-   *   Check for a specific lock name.
+   *   Check for a specific lock config.
+   *
+   * @throws \Drupal\config_readonly\Exception\ConfigReadonlyStorageException
    */
   protected function checkLock($name = '') {
     // If settings.php says to lock config changes and if the config importer
diff --git a/src/Exception/ConfigReadonlyStorageException.php b/src/Exception/ConfigReadonlyStorageException.php
index eb7dc81..b87281a 100644
--- a/src/Exception/ConfigReadonlyStorageException.php
+++ b/src/Exception/ConfigReadonlyStorageException.php
@@ -5,4 +5,6 @@ namespace Drupal\config_readonly\Exception;
 /**
  * Defines an exception thrown when attempting to save config that is locked.
  */
-class ConfigReadonlyStorageException extends \Exception {}
+class ConfigReadonlyStorageException extends \RuntimeException {
+
+}