diff --git a/ch06.asciidoc b/ch06.asciidoc
index 2c583c12..4cf2f0fc 100644
--- a/ch06.asciidoc
+++ b/ch06.asciidoc
@@ -167,7 +167,7 @@ Here are some hints:
 [[tx_inputs]]
 ==== Transaction Inputs
 
-((("transaction", "outputs and inputs", "input components")))((("outputs and inputs", "input components")))((("unspent transaction outputs (UTXO)")))((("UTXO sets")))Transaction inputs identify (by reference) which UTXO will be consumed and provide proof of ownership through an unlocking script.
+((("transactions", "outputs and inputs", "input components")))((("outputs and inputs", "input components")))((("unspent transaction outputs (UTXO)")))((("UTXO sets")))Transaction inputs identify (by reference) which UTXO will be consumed and provide proof of ownership through an unlocking script.
 
 To build a transaction, a wallet selects from the UTXO it controls, UTXO with enough value to make the requested payment. Sometimes one UTXO is enough, other times more than one is needed. For each UTXO that will be consumed to make this payment, the wallet creates one input pointing to the UTXO and unlocks it with an unlocking script.