diff --git a/README.md b/README.md
index 54969c6..2c9d93f 100644
--- a/README.md
+++ b/README.md
@@ -133,13 +133,13 @@ lessCopy code                     主数据库 (DBImpl)
 +-------+-----------------------------------------------+
 
                      二级索引数据库 (indexDb_)
-+----------------------------------------+-------------+
-| indexKey                               | indexValue  |
-+----------------------------------------+-------------+
++-----------------------------------+-------------+
+| indexKey                          | indexValue  |
++-----------------------------------+-------------+
 | name:Customer#000000001           | k_1         |
 | name:Customer#000000001           | k_3         |
 | name:Customer#000000002           | k_2         |
-+----------------------------------------+-------------+
++-----------------------------------+-------------+
 
                      数据关联关系
 主数据库  <------------->  二级索引数据库