diff -u b/core/modules/migrate/src/EventSubscriber/MemoryLimitExceeded.php b/core/modules/migrate/src/EventSubscriber/MemoryLimitExceeded.php
--- b/core/modules/migrate/src/EventSubscriber/MemoryLimitExceeded.php
+++ b/core/modules/migrate/src/EventSubscriber/MemoryLimitExceeded.php
@@ -84,7 +84,8 @@
       $this->entityTypeManager->getStorage($id)->resetCache();
     }
 
-    // @TODO: explore resetting the container.
+    // @todo Explore resetting the container.
+    //   https://www.drupal.org/node/3128793
     // Run garbage collector to further reduce memory.
     gc_collect_cycles();
   }