diff --git a/README.md b/README.md
index 0f5182b..14df93f 100644
--- a/README.md
+++ b/README.md
@@ -7,11 +7,11 @@ network application design(网络应用程序程序设计) in Xidian University.
 
 Network application design(网络应用程序设计)
 
-| Directory      | Description |
-|----------------|-------------|
-| chat-websocket |             |
-| concurrent-tcp |             |
-| ipc            |             |
+| Directory      | Description                                 |
+|----------------|---------------------------------------------|
+| chat-websocket | real-time chat room built upon websocket    |
+| concurrent-tcp | fork-based concurrent TCP server and client |
+| ipc            | inter-process communication in Linux        |
 
 Distributed system(分布式计算)