diff --git a/src/Globals/global_functions.php b/src/Globals/global_functions.php
index 432b3c3b..039aeb7d 100644
--- a/src/Globals/global_functions.php
+++ b/src/Globals/global_functions.php
@@ -7,6 +7,7 @@ use OneBot\Driver\Coroutine\CoroutineInterface;
 use OneBot\Driver\Process\ExecutionResult;
 use OneBot\V12\Object\MessageSegment;
 use Psr\Log\LoggerInterface;
+use Psr\SimpleCache\CacheInterface;
 use ZM\Config\ZMConfig;
 use ZM\Container\ContainerHolder;
 use ZM\Logger\ConsoleLogger;
@@ -259,6 +260,12 @@ function bot(): ZM\Context\BotContext
     return new \ZM\Context\BotContext('', '');
 }
 
+/**
+ * 获取一个 KV 库实例
+ *
+ * @param  string         $name KV 库名称
+ * @return CacheInterface
+ */
 function kv(string $name = ''): Psr\SimpleCache\CacheInterface
 {
     global $kv_class;
diff --git a/src/ZM/Store/KV/KVInterface.php b/src/ZM/Store/KV/KVInterface.php
index 1944585d..156c5668 100644
--- a/src/ZM/Store/KV/KVInterface.php
+++ b/src/ZM/Store/KV/KVInterface.php
@@ -6,7 +6,7 @@ namespace ZM\Store\KV;
 
 use Psr\SimpleCache\CacheInterface;
 
-interface KVInterface
+interface KVInterface extends CacheInterface
 {
     public static function open(string $name = ''): CacheInterface;
 }
diff --git a/src/ZM/Store/KV/LightCache.php b/src/ZM/Store/KV/LightCache.php
index c920e11a..301bb1ab 100644
--- a/src/ZM/Store/KV/LightCache.php
+++ b/src/ZM/Store/KV/LightCache.php
@@ -12,7 +12,7 @@ use ZM\Store\FileSystem;
 /**
  * 轻量、基于本地 JSON 文件的 KV 键值对缓存
  */
-class LightCache implements CacheInterface, KVInterface
+class LightCache implements KVInterface
 {
     /** @var array 存放库对象的列表 */
     private static array $objs = [];
diff --git a/src/ZM/Store/KV/Redis/KVRedis.php b/src/ZM/Store/KV/Redis/KVRedis.php
index f1a2906f..6c1119cf 100644
--- a/src/ZM/Store/KV/Redis/KVRedis.php
+++ b/src/ZM/Store/KV/Redis/KVRedis.php
@@ -7,7 +7,7 @@ namespace ZM\Store\KV\Redis;
 use Psr\SimpleCache\CacheInterface;
 use ZM\Store\KV\KVInterface;
 
-class KVRedis implements CacheInterface, KVInterface
+class KVRedis implements KVInterface
 {
     private string $pool_name;