diff --git a/modules/system/system.api.php b/modules/system/system.api.php
index f1855b9..47501da 100644
--- a/modules/system/system.api.php
+++ b/modules/system/system.api.php
@@ -1888,8 +1888,8 @@ function hook_boot() {
  *
  * This hook is not run on cached pages.
  *
- * To add CSS or JS that should be present on all pages, modules should not
- * implement this hook, but declare these files in their .info file.
+ * To add static CSS or JS that should be present on all pages, modules should
+ * not implement this hook, but declare these files in their .info file.
  *
  * @see hook_boot()
  */