diff --git a/src/Runner/Event/AnalysisStarted.php b/src/Runner/Event/AnalysisStarted.php
index 75c9ff7b166..edd0b6a7b08 100644
--- a/src/Runner/Event/AnalysisStarted.php
+++ b/src/Runner/Event/AnalysisStarted.php
@@ -22,6 +22,8 @@
  * @author Greg Korba <greg@codito.dev>
  *
  * @internal
+ *
+ * @readonly
  */
 final class AnalysisStarted extends Event
 {
diff --git a/src/Runner/Event/FileProcessed.php b/src/Runner/Event/FileProcessed.php
index e90206e5530..407aa5e75bf 100644
--- a/src/Runner/Event/FileProcessed.php
+++ b/src/Runner/Event/FileProcessed.php
@@ -22,6 +22,8 @@
  * @author Dariusz Rumiński <dariusz.ruminski@gmail.com>
  *
  * @internal
+ *
+ * @readonly
  */
 final class FileProcessed extends Event
 {