diff --git a/docs/dapp/sapphire/authentication.md b/docs/dapp/sapphire/authentication.md
index 218a612549..341f1b2b50 100644
--- a/docs/dapp/sapphire/authentication.md
+++ b/docs/dapp/sapphire/authentication.md
@@ -118,7 +118,7 @@ struct SignatureRSV {
 
 contract SignInExample {
     bytes32 public constant EIP712_DOMAIN_TYPEHASH = keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");
-    string public constant SIGNIN_TYPE = "SignIn(address user, uint32 time)";
+    string public constant SIGNIN_TYPE = "SignIn(address user,uint32 time)";
     bytes32 public constant SIGNIN_TYPEHASH = keccak256(bytes(SIGNIN_TYPE));
     bytes32 public immutable DOMAIN_SEPARATOR;
 
@@ -206,4 +206,4 @@ const auth = {user, time, rsv};
 // Then in the future, authenticated view calls can be performed by
 // passing auth without further user interaction authenticated data.
 await contract.authenticatedViewCall(auth, ...args);
-```
\ No newline at end of file
+```