diff --git a/core/modules/path/src/Plugin/Field/FieldType/PathItem.php b/core/modules/path/src/Plugin/Field/FieldType/PathItem.php
index 75c82dbe8d..ef25d34b1c 100644
--- a/core/modules/path/src/Plugin/Field/FieldType/PathItem.php
+++ b/core/modules/path/src/Plugin/Field/FieldType/PathItem.php
@@ -174,6 +174,9 @@ protected function ensureLoaded() {
     if (!$this->isLoaded) {
       $entity = $this->getEntity();
       if (!$entity->isNew()) {
+        // When there is a revisionable entity type and we're loading the
+        // non-default revision the alias might use the revision path or the
+        // canonical path.
         if ($entity->getEntityType()->isRevisionable() && !$entity->isDefaultRevision()) {
           $conditions = ['source' => [
             '/' . $entity->toUrl('revision')->getInternalPath(),
diff --git a/core/modules/path/tests/src/Functional/PathContentModerationTest.php b/core/modules/path/tests/src/Functional/PathContentModerationTest.php
index 32fef3d3f0..05272c3475 100644
--- a/core/modules/path/tests/src/Functional/PathContentModerationTest.php
+++ b/core/modules/path/tests/src/Functional/PathContentModerationTest.php
@@ -39,6 +39,9 @@ protected function setUp() {
     $this->drupalLogin($this->rootUser);
   }
 
+  /**
+   * Tests node path aliases on a moderated content type.
+   */
   public function testNodePathAlias() {
     // Create some moderated content with a path alias.
     $this->drupalGet('node/add/moderated');