diff --git a/core/modules/node/node.module b/core/modules/node/node.module
index 8a2498b..3c932cd 100644
--- a/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -181,7 +181,7 @@ function node_entity_view_display_alter(EntityViewDisplayInterface $display, $co
  * @param $title
  *   (optional) A heading for the resulting list.
  *
- * @return
+ * @return array|false
  *   A renderable array containing a list of linked node titles fetched from
  *   $result, or FALSE if there are no rows in $result.
  */
@@ -466,7 +466,7 @@ function node_revision_load($vid = NULL) {
  * @param $revision_id
  *   The revision ID to delete.
  *
- * @return
+ * @return bool
  *   TRUE if the revision deletion was successful; otherwise, FALSE.
  */
 function node_revision_delete($revision_id) {
@@ -479,7 +479,7 @@ function node_revision_delete($revision_id) {
  * @param \Drupal\node\NodeInterface $node
  *   A node entity.
  *
- * @return
+ * @return int|false
  *   The ID of the node if this is a full page view, otherwise FALSE.
  */
 function node_is_page(NodeInterface $node) {
@@ -730,7 +730,7 @@ function node_user_predelete($account) {
  * @param $number
  *   (optional) The maximum number of nodes to find. Defaults to 10.
  *
- * @return
+ * @return \Drupal\node\NodeInterface[]
  *   An array of node entities or an empty array if there are no recent nodes
  *   visible to the current user.
  */
@@ -777,7 +777,7 @@ function node_get_recent($number = 10) {
  *   (optional) A language code to use for rendering. Defaults to NULL which is
  *   the global content language of the current request.
  *
- * @return
+ * @return array
  *   An array as expected by drupal_render().
  */
 function node_view(NodeInterface $node, $view_mode = 'full', $langcode = NULL) {
@@ -795,7 +795,7 @@ function node_view(NodeInterface $node, $view_mode = 'full', $langcode = NULL) {
  *   (optional) A language code to use for rendering. Defaults to the global
  *   content language of the current request.
  *
- * @return
+ * @return array
  *   An array in the format expected by drupal_render().
  */
 function node_view_multiple($nodes, $view_mode = 'teaser', $langcode = NULL) {
@@ -1081,7 +1081,7 @@ function node_query_node_access_alter(AlterableInterface $query) {
  * @param $rebuild
  *   (optional) The boolean value to be written.
  *
- * @return
+ * @return bool|null
  *   The current value of the flag if no value was provided for $rebuild.
  *
  * @see node_access_rebuild()
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index d3b55f9..49771da 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -387,8 +387,6 @@ function system_theme_suggestions_field(array $variables) {
  *   object created by authorize.php when the user authorizes the operation.
  * @param $page_title
  *   Optional string to use as the page title once redirected to authorize.php.
- * @return
- *   Nothing, this function just initializes variables in the user's session.
  */
 function system_authorized_init($callback, $file, $arguments = array(), $page_title = NULL) {
   // First, figure out what file transfer backends the site supports, and put
@@ -443,6 +441,7 @@ function system_authorized_batch_processing_url(array $options = array()) {
 /**
  * Setup and invoke an operation using authorize.php.
  *
+ * @return RedirectResponse
  * @see system_authorized_init()
  */
 function system_authorized_run($callback, $file, $arguments = array(), $page_title = NULL) {