diff --git a/book/source/glossary.md b/book/source/glossary.md
index c0a3bd5..40c2fa3 100644
--- a/book/source/glossary.md
+++ b/book/source/glossary.md
@@ -574,7 +574,7 @@ Signature Type
     See {term}`OpenPGP Signature Type`.
 
 Signature Type ID
-    A numerical identifier for a {term}`Signature Type`.
+    A numerical identifier for a {term}`Signature Type<OpenPGP Signature Type>`.
 
 Signature Verification
     In cryptography the mechanism of verification relates to a process in which a claim (i.e., a {term}`signature`) is tested (i.e., using the relevant {term}`components<Component>` of a {term}`certificate`).