diff --git a/runtime/hydradx/src/lib.rs b/runtime/hydradx/src/lib.rs
index 71e22c703..d1bd56142 100644
--- a/runtime/hydradx/src/lib.rs
+++ b/runtime/hydradx/src/lib.rs
@@ -484,6 +484,7 @@ impl_runtime_apis! {
 							_ => (None, None),
 						};
 
+			// don't allow calling EVM RPC or Runtime API from a bound address
 			if EVMAccounts::bound_account_id(from).is_some() {
 				return Err(pallet_evm_accounts::Error::<Runtime>::BoundAddressCannotBeUsed.into())
 			};