diff --git a/ch07_authorization-authentication.adoc b/ch07_authorization-authentication.adoc
index 70bc491e..cf0f5997 100644
--- a/ch07_authorization-authentication.adoc
+++ b/ch07_authorization-authentication.adoc
@@ -257,7 +257,7 @@ failed to satisfy the spending conditions placed on the output.
 ==== Pay to Public Key Hash
 
 
-A pay to public key hash (P2PKH) script uses an output script that
+A ((("P2PKH (pay to public key hash)")))((("scripts", "P2PKH (pay to public key hash)")))pay to public key hash (P2PKH) script uses an output script that
 contains a hash that commits to a public key.  P2PKH is best known as
 the basis for a legacy Bitcoin address. A P2PKH output can be spent by
 presenting a public key that matches the hash commitment and a digital