diff --git a/book/source/glossary.md b/book/source/glossary.md
index 7e14be2..d653c0b 100644
--- a/book/source/glossary.md
+++ b/book/source/glossary.md
@@ -119,7 +119,7 @@ Compression
     See {term}`Data Compression`.
 
 Creation Time
-    The point in time at which e.g. an {term}`OpenPGP Certificate`, or one of its {term}`component<Component>` is created.
+    The point in time at which e.g. an {term}`OpenPGP Signature`, an {term}`OpenPGP Certificate`, or one of its {term}`component<Component>` is created.
 
 Creator
     See {term}`Issuer`.