diff --git a/book/source/07-signing_data.md b/book/source/07-signing_data.md
index 0b9952c..88e73b0 100644
--- a/book/source/07-signing_data.md
+++ b/book/source/07-signing_data.md
@@ -45,6 +45,7 @@ A detached signature is produced by calculating an OpenPGP signature over the da
 
 This signature format is especially useful for signing software releases and other files where it is imperative that the content remains unaltered during the signing process.
 
+(inline_signature)=
 ### Inline signatures
 
 An inline signature joins the signed data and its corresponding data signature into a single OpenPGP message.