diff --git a/core/includes/bootstrap.inc b/core/includes/bootstrap.inc
index ce872d4..484b65e 100644
--- a/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -182,7 +182,7 @@ function config_get_config_directory($type) {
  *   The filename of the item if it is to be set explicitly rather
  *   than by consulting the database.
  *
- * @return
+ * @return string|null
  *   The filename of the requested item or NULL if the item is not found.
  */
 function drupal_get_filename($type, $name, $filename = NULL) {
@@ -199,7 +199,6 @@ function drupal_get_filename($type, $name, $filename = NULL) {
   }
 
   // Profiles are converted into modules in system_rebuild_module_data().
-  // @todo Remove false-exposure of profiles as modules.
   if ($type == 'profile') {
     $type = 'module';
   }
@@ -247,7 +246,7 @@ function drupal_get_filename($type, $name, $filename = NULL) {
  *   The name of the item for which the path is requested. Ignored for
  *   $type 'core'.
  *
- * @return
+ * @return string|null
  *   The path to the requested item or an empty string if the item is not found.
  */
 function drupal_get_path($type, $name) {
@@ -859,7 +858,7 @@ function drupal_classloader_register($name, $path) {
  *   internally and should not be passed in; use drupal_static_reset() instead.
  *   (This function's return value should not be used when TRUE is passed in.)
  *
- * @return
+ * @return array
  *   Returns a variable by reference.
  *
  * @see drupal_static_reset()
@@ -935,7 +934,7 @@ function drupal_placeholder($text) {
  * @param ...
  *   Additional arguments to pass to the shutdown function.
  *
- * @return
+ * @return array
  *   Array of shutdown functions to be executed.
  *
  * @see register_shutdown_function()