diff --git a/README.md b/README.md
index 8210bf7..d408c80 100644
--- a/README.md
+++ b/README.md
@@ -90,19 +90,19 @@ yarn dev
 
 Add in you `.env` in root dir with:
 
-```yaml
+```shell
 # Develop backend settings:
 LIVEKIT_KEY="devkey"
 LIVEKIT_SECRET="secret"
 ```
 
-Add SFU parameter in your local config `./public/config.yml`:
+Add SFU parameter in your local config `./public/config.json`:
 
-```yaml
-"livekit": {
-    "server_url": "ws://localhost:7880",
-    "jwt_service_url": "http:/localhost:8881"
-  },
+```json
+,
+  "livekit": {
+      "livekit_service_url": "http://localhost:7881"
+    }
 ```
 
 Run backend components:
diff --git a/config/config.sample.json b/config/config.sample.json
index 35ad184..d87d313 100644
--- a/config/config.sample.json
+++ b/config/config.sample.json
@@ -5,5 +5,8 @@
       "server_name": "call.ems.host"
     }
   },
+  "livekit": {
+      "livekit_service_url": "http://localhost:7881"
+    },
   "eula": "https://static.element.io/legal/online-EULA.pdf"
 }