diff --git a/modules/system/system.api.php b/modules/system/system.api.php
index 3be00dc..f2eba6b 100644
--- a/modules/system/system.api.php
+++ b/modules/system/system.api.php
@@ -2532,11 +2532,15 @@ function hook_requirements($phase) {
  * more tables and their related keys and indexes. A schema is defined by
  * hook_schema() which must live in your module's .install file.
  *
- * By implementing hook_schema() and specifying the tables your module
- * declares, you can easily create and drop these tables on all
- * supported database engines. You don't have to deal with the
- * different SQL dialects for table creation and alteration of the
- * supported database engines.
+ * The tables declared by this hook will be automatically created when
+ * the module is first enabled, and removed when the module is uninstalled.
+ * This happens before hook_install() is invoked, and after hook_uninstall()
+ * is invoked, respectively.
+ *
+ * By declaring the tables used by your module via an implementation of
+ * hook_schema(), these tables will be available on all supported database
+ * engines. You don't have to deal with the different SQL dialects for table
+ * creation and alteration of the supported database engines.
  *
  * See the Schema API Handbook at http://drupal.org/node/146843 for
  * details on schema definition structures.