diff --git a/src/scheduler/AsyncPoolWorkerEntry.php b/src/scheduler/AsyncPoolWorkerEntry.php
index 6f6fdc5d3..0c62ab931 100644
--- a/src/scheduler/AsyncPoolWorkerEntry.php
+++ b/src/scheduler/AsyncPoolWorkerEntry.php
@@ -25,6 +25,9 @@ namespace pocketmine\scheduler;
 
 use function time;
 
+/**
+ * @internal
+ */
 final class AsyncPoolWorkerEntry{
 
 	public int $lastUsed;