diff --git a/tester/README.md b/tester/README.md
index 5255c4f..172fc25 100644
--- a/tester/README.md
+++ b/tester/README.md
@@ -9,6 +9,17 @@ cargo run -- --test
 
 cargo run --bin ctrl
 
+#### sample cmd.json file
+```json
+{
+  "type": "Ota",
+  "content": {
+    "url": "http://192.168.1.10/sphinx-update-",
+    "version": 0
+  }
+}
+```
+
 #### sample .env file
 
 ```
@@ -17,7 +28,5 @@ PASS="bar"
 BROKER="44.198.193.18:1883"
 BROKER_URL="http://44.198.193.18:30000/api"
 SEED=c7629e0f2edf1be66f01c0824022c5d30756ffa0f17213d2be463a458d200803
-NONCE="3"
-VERSION="3"
-OTA_URL="http://192.168.1.10/sphinx-update-"
+NONCE="0"
 ```