diff --git a/book/source/glossary.md b/book/source/glossary.md
index 76d7fed..fe3f25a 100644
--- a/book/source/glossary.md
+++ b/book/source/glossary.md
@@ -20,7 +20,7 @@ Algorithm Preferences
     See [](recipe-algorithm-preferences).
 
 Asymmetric Cryptography
-    Asymmetric cryptography is used in OpenPGP. For a more detailed discussion see [](public-key-cryptography).
+    Asymmetric cryptography (also known as public-key cryptography) is used in OpenPGP to send messages without using a prior shared secret. For a more detailed discussion see [](public-key-cryptography).
 
 Authenticated Encryption With Associated Data
     Short AEAD, refers to an encryption scheme that ensures confidentiality of a message. Additionally, additional data, which is not confidential, may be associated with the message.