diff --git a/README.md b/README.md
index c114e78..05bcad8 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ sync(store, router) // done.
 
 - When the router navigates to a new route, the store's state is updated.
 
-- When the store's `route` state is updated, it notifies the router to navigate to the corresponding path. This enables time-traveling between routes in `vue-devtools`.
+- **`store.state.route` is immutable, because it is derived state from the URL, which is the source of truth**. You should not attempt to trigger navigations by mutating the route object. Instead, just call `$router.go()`.
 
 ### License
 
diff --git a/index.js b/index.js
index 5fbee38..3361310 100644
--- a/index.js
+++ b/index.js
@@ -49,16 +49,7 @@ function patchStore (store) {
       route: {
         mutations: {
           'router/ROUTE_CHANGED': function (state, to) {
-            Object.keys(to).forEach(key => {
-              if (key !== 'matched') {
-                set(state, key, to[key])
-              }
-            })
-            Object.keys(state).forEach(key => {
-              if (!(key in to)) {
-                state[key] = null
-              }
-            })
+            store.state.route = to
           }
         }
       }