diff --git a/core-concepts/did-ddo.md b/core-concepts/did-ddo.md
index 12ff17ee..85b6cda6 100644
--- a/core-concepts/did-ddo.md
+++ b/core-concepts/did-ddo.md
@@ -292,6 +292,7 @@ Parameters:
 ```
 {
 	"type": "smartcontract",
+	"chainId": 1,
 	"address": "0x8149276f275EEFAc110D74AFE8AFECEaeC7d1593",
 	"abi": {
 			"inputs": [],