diff --git a/core/includes/module.inc b/core/includes/module.inc
index 99eac78..44b8b38 100644
--- a/core/includes/module.inc
+++ b/core/includes/module.inc
@@ -622,6 +622,27 @@ function module_uninstall($module_list = array(), $uninstall_dependents = TRUE)
  * @} End of "defgroup hooks".
  */
 
+ /**
+  * @defgroup callbacks Callbacks
+  * @{
+  * Like standard PHP functions, sometimes the Drupal API also needs callbacks
+  * to operate. In this context, a "callback" is a function that a module needs
+  * to define in conjunction with a hook implementation, batch set, plugins, or
+  * other Drupal functionality.
+  *
+  * Specific parts of Drupal require or can take a callback of a particular
+  * signature to accomplish specific task. Each of these signatures is
+  * documented here in the Callbacks section of the developer docuentation.
+  *
+  * The example functions are formed from the prefix "callback" followed by a
+  * descriptive name. These example functions are not part of Drupal core, they
+  * are just models that you can modify.
+  *
+  * See also @link hooks the hooks group page. @endlink
+  *
+  * @} End of "defgroup callbacks".
+  */
+
 /**
  * Returns an array of modules required by core.
  */