diff --git a/log-what-every-software-engineer-should-know-about-real-time-datas-unifying/README.md b/log-what-every-software-engineer-should-know-about-real-time-datas-unifying/README.md
index 2709783..11b2f32 100644
--- a/log-what-every-software-engineer-should-know-about-real-time-datas-unifying/README.md
+++ b/log-what-every-software-engineer-should-know-about-real-time-datas-unifying/README.md
@@ -67,6 +67,8 @@ PS：
     - [数据流图（`data flow graphs`）](part3-logs-and-real-time-stream-processing.md#数据流图data-flow-graphs)
     - [有状态的实时流处理](part3-logs-and-real-time-stream-processing.md#有状态的实时流处理)
     - [日志合并（`log compaction`）](part3-logs-and-real-time-stream-processing.md#日志合并log-compaction)
-- [第四部分：系统建设](part4-system-building.md)
+- [第四部分：构建系统](part4-system-building.md)
+    - [分解单品方式而不是打包套餐方式？](part4-system-building.md#分解单品方式而不是打包套餐方式)
+    - [日志在系统架构中的地位](part4-system-building.md#日志在系统架构中的地位)
 - [结束语](the-end.md)
 - [译跋](translation-postscript.md)
diff --git a/log-what-every-software-engineer-should-know-about-real-time-datas-unifying/part3-logs-and-real-time-stream-processing.md b/log-what-every-software-engineer-should-know-about-real-time-datas-unifying/part3-logs-and-real-time-stream-processing.md
index 103cfb8..c422b28 100644
--- a/log-what-every-software-engineer-should-know-about-real-time-datas-unifying/part3-logs-and-real-time-stream-processing.md
+++ b/log-what-every-software-engineer-should-know-about-real-time-datas-unifying/part3-logs-and-real-time-stream-processing.md
@@ -174,4 +174,4 @@
 
 -----------------
 
-[« 第二部分：数据集成](part2-data-integration.md)　　　　[第四部分：系统建设 »](part4-system-building.md)
+[« 第二部分：数据集成](part2-data-integration.md)　　　　[第四部分：构建系统 »](part4-system-building.md)