diff --git a/.env.local.sample b/.env.local.sample
index 6dfe5314..04f8dfd2 100644
--- a/.env.local.sample
+++ b/.env.local.sample
@@ -1,3 +1,4 @@
 NEXT_PUBLIC_API_URL=http://locahost:4000
+NEXT_PUBLIC_WS_URL=ws://localhost:4000/socket
 NEXT_PUBLIC_QRCODE_HOST=seium.org
 NEXT_PUBLIC_BACKOFFICE_FEATURE_FLAG=true
\ No newline at end of file