diff --git a/src/helpers/eip712.ts b/src/helpers/eip712.ts
index d1f3b9e..dc13f6e 100644
--- a/src/helpers/eip712.ts
+++ b/src/helpers/eip712.ts
@@ -3,6 +3,7 @@ const example = {
     EIP712Domain: [
       { name: "name", type: "string" },
       { name: "version", type: "string" },
+      { name: "chainId", type: "uint256" },
       { name: "verifyingContract", type: "address" },
     ],
     RelayRequest: [