diff --git a/core/modules/node/node.module b/core/modules/node/node.module
index 7295856..bca242b 100644
--- a/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -2669,9 +2669,11 @@ function node_access($op, $node, $account = NULL, $langcode = NULL) {
       $query = db_select('node_access');
       $query->addExpression('1');
       $query->condition('grant_' . $op, 1, '>=');
+      // Check if this grant is given for the node in this language, so we check that grant.
       $nids = db_and()
         ->condition('nid', $node->nid)
         ->condition('langcode', $langcode);
+      // But if the node is published, we take into account the default for this grant, which is saved with nid = 0.
       if ($node->status) {
         $nids = db_or()
           ->condition($nids)
@@ -2988,6 +2990,8 @@ function node_query_node_access_alter(AlterableInterface $query) {
         $subquery->condition($grant_conditions);
       }
       $subquery->condition('na.grant_' . $op, 1, '>=');
+      // If no langcode is given, add a condition for checking the fallback language. If the language is given,
+      // just use it as a condition.
       if ($langcode === FALSE) {
         $subquery->condition('na.fallback', 1, '=');
       }