diff --git a/library/think/model/relation/MorphTo.php b/library/think/model/relation/MorphTo.php
index 504130a4..a3a02934 100644
--- a/library/think/model/relation/MorphTo.php
+++ b/library/think/model/relation/MorphTo.php
@@ -105,7 +105,7 @@ class MorphTo extends Relation
 
     /**
      * 解析模型的完整命名空间
-     * @access public
+     * @access protected
      * @param string $model 模型名（或者完整类名）
      * @return string
      */