diff --git a/book/source/glossary.md b/book/source/glossary.md
index 40846dc..0b55967 100644
--- a/book/source/glossary.md
+++ b/book/source/glossary.md
@@ -292,7 +292,7 @@ Key Revocation Signature Packet
     A {term}`Revocation Self-signature` for an entire {term}`OpenPGP Certificate`.
 
 Key Server
-    A piece of software available over the network, which provides access to {term}`OpenPGP Certificates<OpenPGP Certificate>` e.g., by searching for an {term}`OpenPGP Fingerprint` or {term}`User ID`, via the `HKP` and/ or `HKPS` protocols.
+    A service available over the network, which provides access to {term}`OpenPGP Certificates<OpenPGP Certificate>` e.g., by searching for an {term}`OpenPGP Fingerprint` or {term}`User ID`, via the `HKP` and/ or `HKPS` protocols.
     Several implementations such as [hagrid](https://gitlab.com/keys.openpgp.org/hagrid/), or [hockeypuck](https://github.com/hockeypuck/hockeypuck) exist.
 
 Life-cycle Management