diff --git a/src/swoole/Swoole/Connection/Iterator.php b/src/swoole/Swoole/Connection/Iterator.php
index a42b695..a7e30b9 100644
--- a/src/swoole/Swoole/Connection/Iterator.php
+++ b/src/swoole/Swoole/Connection/Iterator.php
@@ -6,6 +6,8 @@
 
 /**
  * @not-serializable Objects of this class cannot be serialized.
+ * @implements \Iterator<int, int>
+ * @implements \ArrayAccess<int, int>
  */
 class Iterator implements \Iterator, \ArrayAccess, \Countable
 {