diff --git a/Readme.md b/Readme.md
index 6a00431..0351509 100644
--- a/Readme.md
+++ b/Readme.md
@@ -33,7 +33,7 @@
 ## Installation
 
 ```js
-$ npm install koa-session
+$ npm install @viegg/koa-session
 ```
 
 ## Example
@@ -41,7 +41,7 @@ $ npm install koa-session
   View counter example:
 
 ```js
-const session = require('koa-session');
+const session = require('@viegg/koa-session');
 const Koa = require('koa');
 const app = new Koa();
 
@@ -113,7 +113,7 @@ console.log('listening on port 3000');
   Once you pass `options.store`, session storage is dependent on your external store -- you can't access the session if your external store is down. **Use external session stores only if necessary, avoid using session as a cache, keep the session lean, and store it in a cookie if possible!**
 
 
-  The way of generating external session id is controlled by the `options.genid`, which defaults to `Date.now() + '-' + uid.sync(24)`.
+  The way of generating external session id is controlled by the `options.genid`, which defaults to `ctx => Date.now() + '-' + uid.sync(24)`.
 
   If you want to add prefix for all external session id, you can use `options.prefix`, it will not work if `options.genid` present.
 
diff --git a/lib/context.js b/lib/context.js
index 410996b..9edd6ba 100644
--- a/lib/context.js
+++ b/lib/context.js
@@ -202,7 +202,7 @@ class ContextSession {
 
   create(val, externalKey) {
     debug('create session with val: %j externalKey: %s', val, externalKey);
-    if (this.store) this.externalKey = externalKey || this.opts.genid();
+    if (this.store) this.externalKey = externalKey || this.opts.genid(this.ctx);
     this.session = new Session(this, val);
   }
 
diff --git a/package.json b/package.json
index ff25fb3..e759353 100644
--- a/package.json
+++ b/package.json
@@ -1,8 +1,8 @@
 {
-  "name": "koa-session",
+  "name": "@viegg/koa-session",
   "description": "Koa cookie session middleware with external store support",
-  "repository": "koajs/session",
-  "version": "5.10.1",
+  "repository": "iwestlin/session",
+  "version": "5.10.3",
   "keywords": [
     "koa",
     "middleware",