diff --git a/htmlapi/websocket.md b/htmlapi/websocket.md
index 9eb4409f..214169cd 100644
--- a/htmlapi/websocket.md
+++ b/htmlapi/websocket.md
@@ -1,7 +1,7 @@
 ---
 title: WebSocket
 layout: page
-category: bom 
+category: htmlapi
 date: 2012-12-23
 modifiedOn: 2013-12-05
 ---
diff --git a/index.md b/index.md
index 5be23dee..88d81faf 100644
--- a/index.md
+++ b/index.md
@@ -144,6 +144,7 @@ modifiedOn: 2014-05-18
 - [Net模块和DNS模块](nodejs/net.html)
 - [Express框架](nodejs/express.html)
 - [Koa框架](nodejs/koa.html)
+- [mongoDB的应用](nodejs/mongodb.html)
 
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