diff --git a/README.md b/README.md
index ecd9d60..c740b88 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,17 @@ npm run build
 You can run the newly built app with `npm run start`. This uses [sirv](https://github.com/lukeed/sirv), which is included in your package.json's `dependencies` so that the app will work when you deploy to platforms like [Heroku](https://heroku.com).
 
 
+## Single-page app mode
+
+By default, sirv will only respond to requests that match files in `public`. This is to maximise compatibility with static fileservers, allowing you to deploy your app anywhere.
+
+If you're building a single-page app (SPA) with multiple routes, sirv needs to be able to respond to requests for *any* path. You can make it so by editing the `"start"` command in package.json:
+
+```js
+"start": "sirv public --single"
+```
+
+
 ## Deploying to the web
 
 ### With [now](https://zeit.co/now)
diff --git a/package.json b/package.json
index 3b40276..4e791f5 100644
--- a/package.json
+++ b/package.json
@@ -16,6 +16,6 @@
   "scripts": {
     "build": "rollup -c",
     "dev": "rollup -c -w",
-    "start": "sirv public --single"
+    "start": "sirv public"
   }
 }