diff --git a/core/scripts/run-tests.sh b/core/scripts/run-tests.sh
index 4fbd77c254..e1ef7db737 100644
--- a/core/scripts/run-tests.sh
+++ b/core/scripts/run-tests.sh
@@ -468,6 +468,10 @@ function simpletest_script_init() {
   // Detect if we're in the top-level process using the private 'execute-test'
   // argument. Determine if being run on drupal.org's testing infrastructure
   // using the presence of 'drupaltestbot' in the database url.
+  // @todo https://www.drupal.org/project/drupalci_testbot/issues/2860941 Use
+  //   better environment variable to detect DrupalCI.
+  // @todo https://www.drupal.org/project/drupal/issues/2942473 Remove when
+  //   dropping PHPUnit 4 and PHP 5 support.
   if (!$args['execute-test'] && preg_match('/drupalci/', $args['sqlite'])) {
     // Update PHPUnit if needed and possible. There is a later check once the
     // autoloader is in place to ensure we're on the correct version. We need to