diff --git a/ch06_transactions.adoc b/ch06_transactions.adoc
index af4c900b..1be2629c 100644
--- a/ch06_transactions.adoc
+++ b/ch06_transactions.adoc
@@ -382,7 +382,7 @@ order_ for the display version.
 
 ==== Input Script
 
-The input script field is a remnant of the legacy transaction format.  Our
+The ((("transactions", "inputs", "input script")))((("inputs", "input script")))((("input script (transaction inputs)")))input script field is a remnant of the legacy transaction format.  Our
 example transaction input spends a native segwit output that doesn't
 require any data in the input script, so the length prefix for the
 input script is set to zero (0x00).