diff --git a/src/Linter/Linter.php b/src/Linter/Linter.php
index b8619b4473e..86129ab4489 100644
--- a/src/Linter/Linter.php
+++ b/src/Linter/Linter.php
@@ -19,6 +19,8 @@
  *
  * @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
  *
+ * @readonly
+ *
  * @internal
  */
 final class Linter implements LinterInterface
diff --git a/src/Linter/ProcessLinterProcessBuilder.php b/src/Linter/ProcessLinterProcessBuilder.php
index ee9a555e55e..2dd24e17bb9 100644
--- a/src/Linter/ProcessLinterProcessBuilder.php
+++ b/src/Linter/ProcessLinterProcessBuilder.php
@@ -19,6 +19,8 @@
 /**
  * @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
  *
+ * @readonly
+ *
  * @internal
  */
 final class ProcessLinterProcessBuilder
diff --git a/src/Linter/TokenizerLinter.php b/src/Linter/TokenizerLinter.php
index b0920d302ee..fec0b674ffb 100644
--- a/src/Linter/TokenizerLinter.php
+++ b/src/Linter/TokenizerLinter.php
@@ -23,6 +23,8 @@
  *
  * @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
  *
+ * @readonly
+ *
  * @internal
  */
 final class TokenizerLinter implements LinterInterface
diff --git a/src/Linter/TokenizerLintingResult.php b/src/Linter/TokenizerLintingResult.php
index 01fb04a5682..469f2dfdc9e 100644
--- a/src/Linter/TokenizerLintingResult.php
+++ b/src/Linter/TokenizerLintingResult.php
@@ -17,6 +17,8 @@
 /**
  * @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
  *
+ * @readonly
+ *
  * @internal
  */
 final class TokenizerLintingResult implements LintingResultInterface