diff --git a/core/modules/history/lib/Drupal/history/HistoryManagerInterface.php b/core/modules/history/lib/Drupal/history/HistoryManagerInterface.php
index 6094aef..a5c21c2 100644
--- a/core/modules/history/lib/Drupal/history/HistoryManagerInterface.php
+++ b/core/modules/history/lib/Drupal/history/HistoryManagerInterface.php
@@ -11,7 +11,7 @@
 use Drupal\Core\Session\AccountInterface;
 
 /**
- * Provides history manager interface.
+ * Provides an interface to manage a last view timestamp of entities.
  */
 interface HistoryManagerInterface {
 
diff --git a/core/modules/node/node.install b/core/modules/node/node.install
index 4dd4e63..6d2ecb9 100644
--- a/core/modules/node/node.install
+++ b/core/modules/node/node.install
@@ -716,7 +716,7 @@ function node_update_8011() {
  * Convert {history} table to new format and enable History module.
  */
 function node_update_8012() {
-  // @todo replace with proper migrate implementation.
+  // @todo Remove when https://drupal.org/node/2168011 lands.
   // Drop all keys to properly rename constraints.
   db_drop_primary_key('history');
   db_drop_index('history', 'nid');