diff --git a/src/ZM/Store/ZMBuf.php b/src/ZM/Store/ZMBuf.php
index a19c24ec..e09653a9 100644
--- a/src/ZM/Store/ZMBuf.php
+++ b/src/ZM/Store/ZMBuf.php
@@ -33,7 +33,7 @@ class ZMBuf
     /**
      * 上下文容器
      *
-     * @var array<int, ContextInterface>
+     * @var ContextInterface[]
      */
     public static $context_class = [];