diff --git a/core/modules/migrate_drupal/tests/src/source/d6/BlockTest.php b/core/modules/migrate_drupal/tests/src/source/d6/BlockTest.php
index e3ecdfc..7284b6d 100644
--- a/core/modules/migrate_drupal/tests/src/source/d6/BlockTest.php
+++ b/core/modules/migrate_drupal/tests/src/source/d6/BlockTest.php
@@ -86,6 +86,7 @@ protected function setUp() {
    * {@inheritdoc}
    */
   public function testRetrieval() {
+    // @todo: Fix this as per https://www.drupal.org/node/2299795
     $this->markTestIncomplete('FakeSelect does not support multiple source identifiers, can not test.');
   }
 
diff --git a/core/modules/migrate_drupal/tests/src/source/d6/FieldInstanceTest.php b/core/modules/migrate_drupal/tests/src/source/d6/FieldInstanceTest.php
index 9ca2e79..9f13e3e 100644
--- a/core/modules/migrate_drupal/tests/src/source/d6/FieldInstanceTest.php
+++ b/core/modules/migrate_drupal/tests/src/source/d6/FieldInstanceTest.php
@@ -98,6 +98,7 @@ protected function setUp() {
    * {@inheritdoc}
    */
   public function testRetrieval() {
+    // @todo: Fix this as per https://www.drupal.org/node/2299795
     $this->markTestIncomplete('FakeSelect does not support multiple source identifiers, can not test.');
   }
 
diff --git a/core/modules/migrate_drupal/tests/src/source/d6/NodeRevisionTest.php b/core/modules/migrate_drupal/tests/src/source/d6/NodeRevisionTest.php
index 73e1835..e87cb67 100644
--- a/core/modules/migrate_drupal/tests/src/source/d6/NodeRevisionTest.php
+++ b/core/modules/migrate_drupal/tests/src/source/d6/NodeRevisionTest.php
@@ -329,6 +329,7 @@ protected function setUp() {
    * {@inheritdoc}
    */
   public function testRetrieval() {
+    // @todo: Fix this as per https://www.drupal.org/node/2299795
     $this->markTestIncomplete('FakeSelect does not support multiple source identifiers, can not test.');
   }