diff --git a/src/webauthn/src/AuthenticatorAssertionResponseValidator.php b/src/webauthn/src/AuthenticatorAssertionResponseValidator.php
index d6923b72..ff1ff9be 100644
--- a/src/webauthn/src/AuthenticatorAssertionResponseValidator.php
+++ b/src/webauthn/src/AuthenticatorAssertionResponseValidator.php
@@ -80,7 +80,7 @@ public function __construct(
             trigger_deprecation(
                 'web-auth/webauthn-lib',
                 '4.8.0',
-                'The parameter "$ceremonyStepManager" will mandatory in 5.0.0. Please set a CeremonyStepManager object instead and set null for $algorithmManager and $extensionOutputCheckerHandler.'
+                'The parameter "$ceremonyStepManager" will become mandatory in 5.0.0. Please set a CeremonyStepManager object instead and set null for $algorithmManager and $extensionOutputCheckerHandler.'
             );
         }
         $this->logger = new NullLogger();