diff --git a/book/source/04-certificates.md b/book/source/04-certificates.md
index 49d72f2..a7df3e7 100644
--- a/book/source/04-certificates.md
+++ b/book/source/04-certificates.md
@@ -580,7 +580,7 @@ After the update, the updated copy of the certificate will usually have a fresh
 (metadata_graph)=
 ### Metadata leak of Social Graph
 
-Third-party certifications are signatures over identity components made by other certificates.
+Third-party certifications are signatures over identity components made by other users.
 
 These certifications form the back-bone of the OpenPGP trust-model called the Web of Trust. The name stems from the fact that the collection of certifications forms a unidirectional graph resembling a web. Each edge of the graph connects the signing certificate to the identity component associated with another certificate.