diff --git a/core/modules/system/theme.api.php b/core/modules/system/theme.api.php
index eef4f5c..c2ac9a9 100644
--- a/core/modules/system/theme.api.php
+++ b/core/modules/system/theme.api.php
@@ -848,10 +848,10 @@ function hook_js_settings_alter(array &$settings, \Drupal\Core\Asset\AttachedAss
  * @param $libraries
  *   The JavaScript/CSS libraries provided by $module. Keyed by internal library
  *   name and passed by reference.
- * @param $module
- *   The name of the module that registered the libraries.
+ * @param $extension
+ *   The name of the extension that registered a library.
  */
-function hook_library_info_alter(&$libraries, $module) {
+function hook_library_info_alter(&$libraries, $extension) {
   // Update Farbtastic to version 2.0.
   if ($module == 'core' && isset($libraries['jquery.farbtastic'])) {
     // Verify existing version is older than the one we are updating to.