diff --git a/book/source/adv/signing_data.md b/book/source/adv/signing_data.md
index 4fefc7a..68ac002 100644
--- a/book/source/adv/signing_data.md
+++ b/book/source/adv/signing_data.md
@@ -154,7 +154,7 @@ In this format, the signature packets are stored ahead of the message itself:
 
 1. **{term}`Data signature packets<OpenPGP Signature Packet>`**: These one or more packets contain the {term}`cryptographic signature` corresponding to the original data.
 
-2. [**{term}`OpenPGP message`**](https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-12.html#lit): This contains the original data (e.g., the body of a message), without additional interpretation or conversion.
+2. **{term}`OpenPGP message`**: This contains the original data (e.g., the body of a message), without additional interpretation or conversion.
 
 ```{figure} ../plain_svg/prefixed-signed-message.svg
 :name: fig-prefixed-signed-message