diff --git a/book/source/04-certificates.md b/book/source/04-certificates.md
index 8c110d4..e0d334f 100644
--- a/book/source/04-certificates.md
+++ b/book/source/04-certificates.md
@@ -148,8 +148,6 @@ User IDs are associated with preference settings (such as preferred encryption a
 
 ### Linking the components of an OpenPGP certificate
 
-Internally, an OpenPGP certificate consists of OpenPGP packets. Those packets are individual, independent chunks of data, and are combined by merely stringing them together, one after the other.
-
 So far we've looked at the components in an OpenPGP certificate, but certificates actually contain another set of elements, which bind the components together, and add metadata to them.
 
 Internally, an OpenPGP certificate consists of a sequence of OpenPGP packets. These packets are just stringed together, one after the other. When a certificate is stored in a file[^tpk], it's easy to remove some of these packets, or add new ones.