diff --git a/README.md b/README.md
index 717210f..f4dcddd 100644
--- a/README.md
+++ b/README.md
@@ -129,6 +129,7 @@ This wrapper now delegates to `BlackWall\Auth\AuthClient`.
 
 - Always validate OAuth `state` in callback handlers.
 - Handle provider callback errors (`error`, `error_description`) explicitly; treat `access_denied` as an expected user/authorisation outcome rather than a transport failure.
+- Expect `access_denied` even after the consent page is displayed if provider-side project membership or tenant scope changes before consent submission.
 - For OIDC providers, include a per-request `nonce` in authorisation requests.
 - Always use HTTPS in production.
 - Store refresh tokens securely.