diff --git a/library/think/Model.php b/library/think/Model.php
index 2dc27b48ab0d42a4755d3473ab2a696f641c2efc..fcae0ae9edd8878caee9f25fc475337e82f4b598 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -1309,10 +1309,10 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
     }
 
     /**
-     * 字段值(延迟)增长
+     * 字段值(延迟)减少
      * @access public
      * @param string  $field    字段名
-     * @param integer $step     增长值
+     * @param integer $step     减少值
      * @param integer $lazyTime 延时时间(s)
      * @return integer|true
      * @throws Exception