diff --git a/src/verifier/UserOpWebAuthnCosignVerifier.sol b/src/verifier/UserOpWebAuthnCosignVerifier.sol
index 6f57c33..b27a84f 100644
--- a/src/verifier/UserOpWebAuthnCosignVerifier.sol
+++ b/src/verifier/UserOpWebAuthnCosignVerifier.sol
@@ -39,9 +39,11 @@ contract UserOpWebAuthnCosignVerifier is IVerifier, OnlyKeystore {
 
         (address cosigner, bytes32 x, bytes32 y) = abi.decode(config, (address, bytes32, bytes32));
         WebAuthn.WebAuthnAuth memory auth = WebAuthn.tryDecodeAuth(webauthnData);
+
+        // Note: always run verification for both signatures in order to calculate accurate gas
+        // estimates during simulation with dummy signers.
         bool cosignValid = cosigner == ECDSA.recover(message, ecdsaSignature);
         bool webauthnValid = WebAuthn.verify(abi.encode(message), true, auth, x, y);
-
         return (cosignValid && webauthnValid) ? SIG_VALIDATION_SUCCESS : SIG_VALIDATION_FAILED;
     }
 }