diff --git a/tests/Unit/CSSList/AtRuleBlockListTest.php b/tests/Unit/CSSList/AtRuleBlockListTest.php
index 782d1e3c..0537f7d1 100644
--- a/tests/Unit/CSSList/AtRuleBlockListTest.php
+++ b/tests/Unit/CSSList/AtRuleBlockListTest.php
@@ -16,6 +16,10 @@
  */
 final class AtRuleBlockListTest extends TestCase
 {
+    /*
+    * Tests for the implemented interfaces
+    */
+
     /**
      * @test
      */
@@ -46,6 +50,10 @@ public function implementsCommentable(): void
         self::assertInstanceOf(Commentable::class, $subject);
     }
 
+    /*
+     * not grouped yet
+     */
+
     /**
      * @test
      */
diff --git a/tests/Unit/CSSList/DocumentTest.php b/tests/Unit/CSSList/DocumentTest.php
index baec691b..3d1b1257 100644
--- a/tests/Unit/CSSList/DocumentTest.php
+++ b/tests/Unit/CSSList/DocumentTest.php
@@ -22,6 +22,10 @@
  */
 final class DocumentTest extends TestCase
 {
+    /*
+    * Tests for the implemented interfaces
+    */
+
     /**
      * @test
      */
@@ -38,6 +42,10 @@ public function implementsCommentable(): void
         self::assertInstanceOf(Commentable::class, new Document());
     }
 
+    /*
+     * not grouped yet
+     */
+
     /**
      * @test
      */
diff --git a/tests/Unit/CSSList/KeyFrameTest.php b/tests/Unit/CSSList/KeyFrameTest.php
index 89f96953..72ec89a4 100644
--- a/tests/Unit/CSSList/KeyFrameTest.php
+++ b/tests/Unit/CSSList/KeyFrameTest.php
@@ -16,6 +16,10 @@
  */
 final class KeyFrameTest extends TestCase
 {
+    /*
+    * Tests for the implemented interfaces
+    */
+
     /**
      * @test
      */
@@ -46,6 +50,10 @@ public function implementsCommentable(): void
         self::assertInstanceOf(Commentable::class, $subject);
     }
 
+    /*
+     * not grouped yet
+     */
+
     /**
      * @test
      */