diff --git a/book/source/04-certificates.md b/book/source/04-certificates.md
index 637b048..3064ea9 100644
--- a/book/source/04-certificates.md
+++ b/book/source/04-certificates.md
@@ -148,14 +148,7 @@ Within a certificate, a specific User ID is designated as the [Primary User ID](
 
 Each User ID carries associated preference settings, such as preferred encryption algorithms, which is detailed in {numref}`zooming_in_user_id`). The preferences associated with the Primary User ID take precedence by default.
 
-```{admonition} TODO
-:class: warning
-
-i think crypto-refresh suggests that the direct key signature should hold the default preferences?
-we might need to write a more nuanced text here, about how DKS and primary user id interact in v6, and mention the differences to v4? 
-
-the primary User ID can also specify metadata about the primary key
-```
+The primary User ID was historically sometimes used to store preferences that apply to the certificate as a whole. For more details on this, see {ref}`dks-puid`.
 
 ### User attributes in OpenPGP
 While