Index: modules/system/system.api.php
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.api.php,v
retrieving revision 1.120
diff -u -r1.120 system.api.php
--- modules/system/system.api.php	13 Jan 2010 06:26:49 -0000	1.120
+++ modules/system/system.api.php	13 Jan 2010 18:30:16 -0000
@@ -24,6 +24,9 @@
  * frequently called should be left in the main module file so that they are
  * always available.
  *
+ * Note: In previous versions of Drupal, hook_hook_info() declared triggers.
+ * Triggers are now declared in hook_trigger_info().
+ *
  * @return
  *   An associative array whose keys are hook names and whose values are an
  *   associative array containing: