diff --git a/README.md b/README.md
index b4e0080..f2afe09 100644
--- a/README.md
+++ b/README.md
@@ -224,7 +224,7 @@ The only difference is:
 ```json
 {
     "channel": "IME Stream",
-    "ContractId": "12345",
+    "contractId": "12345",
     "timestamp": "2026-05-23T15:10:00.000000",
     "data": {}
 }