diff --git a/lessons/06-params.md b/lessons/06-params.md
index 1554f465..40a2f011 100644
--- a/lessons/06-params.md
+++ b/lessons/06-params.md
@@ -47,7 +47,7 @@ Now open up `index.js` and add the new route.
 import Repo from './modules/Repo'
 
 render((
-  <Router>
+  <Router history={hashHistory}>
     <Route path="/" component={App}>
       <IndexRoute component={Home}/>
       <Route path="/repos" component={Repos}/>