diff --git a/ch08_signatures.adoc b/ch08_signatures.adoc
index 826dfe48..3ef69faf 100644
--- a/ch08_signatures.adoc
+++ b/ch08_signatures.adoc
@@ -46,7 +46,7 @@ public key.
 
 ==== Creating a Digital Signature
 
-In Bitcoin's use of digital signature algorithms, the "message" being
+In Bitcoin's((("digital signatures", "creating"))) use of digital signature algorithms, the "message" being
 signed is the transaction, or more accurately a hash of a specific
 subset of the data in the transaction, called the _commitment hash_ (see
 <<sighash_types>>). The