diff --git a/.gitignore b/.gitignore
index b0beecc..84c4833 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,7 +11,7 @@ build
 
 # misc
 .DS_Store
-.env
 npm-debug.log
+.env*.local
 
 src/data.json
diff --git a/src/index.js b/src/index.js
index f01f9c9..ee85c65 100644
--- a/src/index.js
+++ b/src/index.js
@@ -18,3 +18,7 @@ if (module.hot) {
 }
 
 registerServiceWorker()
+
+if (process.env.REACT_APP_SITE_URL && 'localStorage' in window) {
+  window.localStorage.setItem('netlifySiteURL', process.env.REACT_APP_SITE_URL)
+}