diff --git a/book/source/07-signing_data.md b/book/source/07-signing_data.md
index cc2a757..1d0bb34 100644
--- a/book/source/07-signing_data.md
+++ b/book/source/07-signing_data.md
@@ -15,7 +15,7 @@ it does not automatically signal if the expected party indeed controls the signe
 
 Data signatures can only be issued by component keys with the *signing* [key flag](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#name-key-flags).
 
-Note that data signatures are distinct from {ref}`component_signatures_chapter`, which are used to attach metadata or subkeys to a certificate.
+Note that data signatures are distinct from {ref}`component_signatures_chapter`, which are used to form and maintain certificates, as well as to certify identities on certificates.
 
 (data_signature_types)=
 ## Signature types