diff --git a/book/source/glossary.md b/book/source/glossary.md
index e8ba2b5..44d2ecf 100644
--- a/book/source/glossary.md
+++ b/book/source/glossary.md
@@ -90,7 +90,7 @@ Certification Revocation Signature Packet
 Certification Signature
     See {term}`Certification`.
 
-Certifying Self-signature
+Certifying Self-Signature
     An {term}`OpenPGP Signature Packet` by the {term}`Certificate Holder` on an {term}`Identity Component` of their own {term}`Certificate`.
 
 Certifying Signature