diff --git a/extend/fast/Random.php b/extend/fast/Random.php
index 7edade5b5863881a92d40c283eb77d7f89d2b648..b063d87f614bd92f1ab22d871a73d3f6fc508301 100644
--- a/extend/fast/Random.php
+++ b/extend/fast/Random.php
@@ -42,7 +42,7 @@ class Random
     }
 
     /**
-     * 数字和字母组合的随机字符串
+     * 生成制定长度的无0随机数字
      *
      * @param int $len 长度
      * @return string