diff --git a/tests/phpunit/data/html5lib-tests/README.md b/tests/phpunit/data/html5lib-tests/README.md
index 07d8ecb62551b..7870e158e0e1c 100644
--- a/tests/phpunit/data/html5lib-tests/README.md
+++ b/tests/phpunit/data/html5lib-tests/README.md
@@ -6,3 +6,7 @@ This test data was taken from:
 https://github.com/html5lib/html5lib-tests
 
 The sha was `a9f44960a9fedf265093d22b2aa3c7ca123727b9`.
+
+## Instructions
+
+@todo add instructions here.
diff --git a/tests/phpunit/tests/html-api/wpHtmlProcessorHtml5lib.php b/tests/phpunit/tests/html-api/wpHtmlProcessorHtml5lib.php
index 8413027842542..d15b6e03302c1 100644
--- a/tests/phpunit/tests/html-api/wpHtmlProcessorHtml5lib.php
+++ b/tests/phpunit/tests/html-api/wpHtmlProcessorHtml5lib.php
@@ -1,7 +1,9 @@
 <?php
 
 /**
- * Unit tests covering WP_HTML_Processor functionality.
+ * Unit tests covering HTML API functionality.
+ *
+ * @todo add descriptive paragraph here.
  *
  * @package WordPress
  * @subpackage HTML-API