diff --git a/docs/TODO b/docs/TODO
index a7ea191147..b7530dc3f1 100644
--- a/docs/TODO
+++ b/docs/TODO
@@ -100,6 +100,7 @@
  10.1 SASL based authentication mechanisms
  10.2 CURLOPT_SSL_CTX_FUNCTION for LDAPS
  10.3 Paged searches on LDAP server
+ 10.4 Certificate-Based Authentication
 
  11. SMB
  11.1 File listing support
@@ -751,6 +752,12 @@
 
  https://github.com/curl/curl/issues/4452
 
+10.4 Certificate-Based Authentication
+
+ LDAPS not possible with MAC and Windows with Certificate-Based Authentication
+
+ https://github.com/curl/curl/issues/9641
+
 11. SMB
 
 11.1 File listing support