diff --git a/README.md b/README.md
index 58b989c..494824a 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,18 @@ Note for Firefox user:
 
 **yacd** is using the [Fetch (Web) API][fetch-api] to stream chunked API response from Clash to draw the traffic chart. But currently the streaming feature in Firefox needs to be turned on manually. Here is how to:
 
-Visit `about:config`, search for `dom.streams.enabled` and `javascript.options.streams`, double click those item to turn them on.
+Visit `about:config`, search for `dom.streams.enabled` and `javascript.options.streams`, double click those items to turn them on.
 
 [fetch-api]: https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API
+
+## Development
+
+```sh
+# install dependencies
+yarn
+
+# start the dev server
+yarn start
+
+# go to http://127.0.0.1:3000
+```