diff --git a/book/source/08-signing_components.md b/book/source/08-signing_components.md
index 9972bb4..c7b6a49 100644
--- a/book/source/08-signing_components.md
+++ b/book/source/08-signing_components.md
@@ -153,7 +153,7 @@ Linking a User ID to an OpenPGP certificate
 
 The signatures that bind subkeys and identity components to a certificate serve dual purposes: linking components to the certificate and adding metadata to components.
 
-Unlike subkeys and identities, the primary key of a certificate doesn't require a linking signature since it serves as the central anchor of the certificate.
+Unlike subkeys and identities, the primary key of a certificate doesn't require a linking signature since it serves as the central anchor of the certificate. However, associating metadata with the primary key is still essential, as it generally applies to the entire certificate.
 
 Metadata can be added to the primary key via two mechanisms: