diff --git a/tests/OutputFormatTest.php b/tests/OutputFormatTest.php
index b447235f..f49eb0fd 100644
--- a/tests/OutputFormatTest.php
+++ b/tests/OutputFormatTest.php
@@ -6,6 +6,9 @@
 use Sabberworm\CSS\OutputFormat;
 use Sabberworm\CSS\Parser;
 
+/**
+ * @covers \Sabberworm\CSS\OutputFormat
+ */
 class OutputFormatTest extends TestCase
 {
     /**
diff --git a/tests/ParserTest.php b/tests/ParserTest.php
index fccb742d..02415a2f 100644
--- a/tests/ParserTest.php
+++ b/tests/ParserTest.php
@@ -19,6 +19,18 @@
 use Sabberworm\CSS\Value\Size;
 use Sabberworm\CSS\Value\URL;
 
+/**
+ * @covers \Sabberworm\CSS\Parser
+ * @covers \Sabberworm\CSS\CSSList\Document::parse
+ * @covers \Sabberworm\CSS\Rule\Rule::parse
+ * @covers \Sabberworm\CSS\RuleSet\DeclarationBlock::parse
+ * @covers \Sabberworm\CSS\Value\CalcFunction::parse
+ * @covers \Sabberworm\CSS\Value\Color::parse
+ * @covers \Sabberworm\CSS\Value\CSSString::parse
+ * @covers \Sabberworm\CSS\Value\LineName::parse
+ * @covers \Sabberworm\CSS\Value\Size::parse
+ * @covers \Sabberworm\CSS\Value\URL::parse
+ */
 class ParserTest extends TestCase
 {
     public function testFiles()
diff --git a/tests/RuleSet/DeclarationBlockTest.php b/tests/RuleSet/DeclarationBlockTest.php
index 31fe7f52..65986ef3 100644
--- a/tests/RuleSet/DeclarationBlockTest.php
+++ b/tests/RuleSet/DeclarationBlockTest.php
@@ -7,6 +7,9 @@
 use Sabberworm\CSS\Rule\Rule;
 use Sabberworm\CSS\Value\Size;
 
+/**
+ * @covers \Sabberworm\CSS\RuleSet\DeclarationBlock
+ */
 class DeclarationBlockTest extends TestCase
 {
     /**
diff --git a/tests/RuleSet/LenientParsingTest.php b/tests/RuleSet/LenientParsingTest.php
index f7530958..50c5bf52 100644
--- a/tests/RuleSet/LenientParsingTest.php
+++ b/tests/RuleSet/LenientParsingTest.php
@@ -6,6 +6,18 @@
 use Sabberworm\CSS\Parser;
 use Sabberworm\CSS\Settings;
 
+/**
+ * @covers \Sabberworm\CSS\Parser
+ * @covers \Sabberworm\CSS\CSSList\Document::parse
+ * @covers \Sabberworm\CSS\Rule\Rule::parse
+ * @covers \Sabberworm\CSS\RuleSet\DeclarationBlock::parse
+ * @covers \Sabberworm\CSS\Value\CalcFunction::parse
+ * @covers \Sabberworm\CSS\Value\Color::parse
+ * @covers \Sabberworm\CSS\Value\CSSString::parse
+ * @covers \Sabberworm\CSS\Value\LineName::parse
+ * @covers \Sabberworm\CSS\Value\Size::parse
+ * @covers \Sabberworm\CSS\Value\URL::parse
+ */
 class LenientParsingTest extends TestCase
 {
     /**