diff --git a/book/source/glossary.md b/book/source/glossary.md
index f87bd6c..40846dc 100644
--- a/book/source/glossary.md
+++ b/book/source/glossary.md
@@ -268,7 +268,7 @@ Key
     - {term}`OpenPGP key` (which in turn refers to either an {term}`OpenPGP Certificate` or a {term}`Transferable Secret Key`
 
 Key Expiration Time Subpacket
-    An {term}`OpenPGP Signature Subpacket Type` which defines the {term}`Expiration Time` for an {term}`OpenPGP Signature Packet` on a {term}`key<Component Key>`.
+    An {term}`OpenPGP Signature Subpacket Type` which defines the {term}`Expiration Time` for a {term}`key<Component Key>`.
 
     See [RFC 5.2.3.13](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#name-key-expiration-time)