Improve GraphiQL instructions

Author: slax57

README.md

@@ -91,7 +91,7 @@ Go to http://localhost:3000/?query=%7B%20Post%28id%3A%201%29%20%7B%20id%20title%
 
 The json-graphql-server accepts queries in GET and POST. Under the hood, it uses [the `express-graphql` module](https://github.com/graphql/express-graphql). Please refer to their documentations for details about passing variables, etc.
 
-Note that the server is [GraphiQL](https://github.com/graphql/graphiql) enabled, so you can query your server using a full-featured graphical user interface, providing autosuggest, history, etc.
+Note that the server is [GraphiQL](https://github.com/graphql/graphiql) enabled, so you can query your server using a full-featured graphical user interface, providing autosuggest, history, etc. Just browse http://localhost:3000/ to access it.
 
 ![GraphiQL client using json-graphql-server](http://static.marmelab.com/graphiql-json.png)