diff --git a/book/source/05-private.md b/book/source/05-private.md
index c10df3b..d345425 100644
--- a/book/source/05-private.md
+++ b/book/source/05-private.md
@@ -4,13 +4,15 @@ SPDX-License-Identifier: CC-BY-SA-4.0
 -->
 
 (private_key_chapter)=
-# Private key material in OpenPGP
+# Managing private key material in OpenPGP
+
+## Overview of private keys
 
 This chapter discusses the handling of private key material within OpenPGP.
 
 Private key material is associated with component keys, which are integral parts of [OpenPGP certificates](certificates_chapter). For a discussion of packet structure internals, see the chapter {ref}`zoom_private`.
 
-## Terminology: "certificates" and "private keys"
+## "Certificates" and "private keys" explained
 
 Recall that in this document, the term *OpenPGP certificate* refers to what are commonly known as "OpenPGP public keys." OpenPGP certificates are the combination of component public keys, identity components, binding self-signatures, and third-party certifications,
 as discussed in the previous chapter ({ref}`certificates_chapter`).