diff --git a/README.md b/README.md
index 2efe3ac..bdc3d09 100644
--- a/README.md
+++ b/README.md
@@ -131,6 +131,7 @@ This wrapper now delegates to `BlackWall\Auth\AuthClient`.
 - 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.
 - Register only HTTPS redirect URIs in provider client settings (HTTP should be used only for localhost loopback during development).
+- Use OAuth/portal authentication endpoints for end users; provider admin login endpoints enforce separate admin scope checks.
 - For OIDC providers, include a per-request `nonce` in authorisation requests.
 - Always use HTTPS in production.
 - Store refresh tokens securely.