diff --git a/module/doc/control.php b/module/doc/control.php
index 5ba12673e9..488a15c81e 100755
--- a/module/doc/control.php
+++ b/module/doc/control.php
@@ -12,6 +12,7 @@
 class doc extends control
 {
     /**
+     * 构造函数，加载通用模块。
      * Construct function, load user, tree, action auto.
      *
      * @access public