diff --git a/includes/module.inc b/includes/module.inc
index 6d9b33f1301e95a6073fd0557b6b903d496189ad..d932f07b96e1d73ba034eea4449be78e43336c66 100644
--- a/includes/module.inc
+++ b/includes/module.inc
@@ -744,7 +744,14 @@ function module_implements($hook, $sort = FALSE, $reset = FALSE) {
 }
 
 /**
- * Retrieves a list of what hooks are explicitly declared.
+ * Retrieves a list of hooks that are declared through hook_hook_info().
+ *
+ * @return
+ *   An associative array whose keys are hook names and whose values are an
+ *   associative array containing a group name. The structure of the array
+ *   is the same as the return value of hook_hook_info().
+ *
+ * @see hook_hook_info()
  */
 function module_hook_info() {
   // This function is indirectly invoked from bootstrap_invoke_all(), in which