diff --git a/tester/README.md b/tester/README.md
index 172fc25..570d641 100644
--- a/tester/README.md
+++ b/tester/README.md
@@ -12,10 +12,9 @@ cargo run --bin ctrl
 #### sample cmd.json file
 ```json
 {
-  "type": "Ota",
-  "content": {
-    "url": "http://192.168.1.10/sphinx-update-",
-    "version": 0
+  "Ota": {
+      "url": "http://192.168.86.21:12346/sphinx-update-",
+      "version": 0
   }
 }
 ```
@@ -30,3 +29,8 @@ BROKER_URL="http://44.198.193.18:30000/api"
 SEED=c7629e0f2edf1be66f01c0824022c5d30756ffa0f17213d2be463a458d200803
 NONCE="0"
 ```
+
+### sample update server
+cd into the directory where you placed the .bin file you want to send to the signers
+mini_httpd -p 12346
+then use something like the cmd.json example above to tell signer about the update
diff --git a/tester/cmd.json b/tester/cmd.json
index 52353ed..c7c87f9 100644
--- a/tester/cmd.json
+++ b/tester/cmd.json
@@ -1 +1,6 @@
-"Nonce"
+{
+  "Ota": {
+    "url": "http://192.168.86.21:12346/sphinx-update-",
+    "version": 0
+  }
+}