diff --git a/book/source/04-certificates.md b/book/source/04-certificates.md
index 771f39b..8b03e4e 100644
--- a/book/source/04-certificates.md
+++ b/book/source/04-certificates.md
@@ -64,7 +64,7 @@ OpenPGP component keys logically consist of an [asymmetric cryptographic keypair
 An OpenPGP component key
 ```
 
-In OpenPGP, component keys containing private key material also include metadata specifying the password protection scheme. This is another facet of metadata, akin to the aforementioned creation timestamp and additional parameters for certain algorithms. However, this discussion focuses on OpenPGP certificates, in which the component keys contain only the public part of its cryptographic key data. For information on private keys in OpenPGP, see {numref}`private_key_chapter`.
+Component keys containing private key material also include metadata specifying the password protection scheme. This is another facet of metadata, akin to the aforementioned creation timestamp and additional parameters for certain algorithms. However, this discussion focuses on OpenPGP certificates, in which the component keys contain only the public part of its cryptographic key data. For information on private keys in OpenPGP, see {numref}`private_key_chapter`.
 
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