add FIXME
diff --git a/lib/picotls.c b/lib/picotls.c
index 52c3d49..8f4d1a9 100644
--- a/lib/picotls.c
+++ b/lib/picotls.c
@@ -3219,7 +3219,9 @@
goto Exit;
if (tls->client.certificate_request.context.base != NULL) {
- /* If this is a resumed session, the server must not send the certificate request in the handshake */
+ /* The client must not send a certifiate if:
+ * - this is a resumed session, in which case the server is forbidden from sending the certificate request
+ * - ECH was offered by the client but the server rejected (FIXME) */
if (tls->is_psk_handshake) {
ret = PTLS_ALERT_ILLEGAL_PARAMETER;
goto Exit;