diff --git a/book/source/03-cryptography.md b/book/source/03-cryptography.md
index 06ec95a..c070e88 100644
--- a/book/source/03-cryptography.md
+++ b/book/source/03-cryptography.md
@@ -102,7 +102,7 @@ It's important to note that in many scenarios, only the public key is exposed or
 ```{figure} diag/public_key.png
 ---
 ---
-The public parts of an asymmetric key pair
+The public part of an asymmetric key pair
 ```
 
 ### Usage and terminology in OpenPGP