diff --git a/book/source/05-private.md b/book/source/05-private.md
index 85cf6e9..7f96d88 100644
--- a/book/source/05-private.md
+++ b/book/source/05-private.md
@@ -96,8 +96,7 @@ Designs of private key subsystems in the OpenPGP space differ:
 
 Either way: at most, a private key subsystem should need access to individual component keys and the associated private key material.
 
-```{admonition} TODO
-:class: warning
+```{note}
 
 Keeping a copy of the full certificate information in the private key subsystem can cause "split brain" problems. E.g.: expiration times could then differ between different subsystems, when they keep different copies of the certificate information.