diff --git a/ch09_fees.adoc b/ch09_fees.adoc
index 266e3f16..7d32fd67 100644
--- a/ch09_fees.adoc
+++ b/ch09_fees.adoc
@@ -56,7 +56,7 @@ management of Bitcoin transactions.
 
 === Who Pays the Transaction Fee?
 
-Most payment systems involve some sort of fee for transacting, but
+Most ((("transaction fees", "responsibility for", id="fees-responsibility")))payment systems involve some sort of fee for transacting, but
 often this fee is hidden from typical buyers.  For example, a merchant
 may advertise the same item for the same price whether you pay with cash
 or a credit card even though their payment processor may charge them
@@ -92,7 +92,7 @@ Bitcoin for spenders to pay transaction fees.  There are exceptions,
 such as for merchants that accept unconfirmed transactions and in
 protocols that don't immediately broadcast transactions after they are
 signed (preventing the spender from being able to choose an appropriate
-fee for the current market).  We'll explore those exceptions later.
+fee for the current market).  We'll explore those exceptions((("transaction fees", "responsibility for", startref="fees-responsibility"))) later.
 
 === Fees and Fee Rates