diff --git a/ch09_fees.adoc b/ch09_fees.adoc
index 5b8ab542..266e3f16 100644
--- a/ch09_fees.adoc
+++ b/ch09_fees.adoc
@@ -25,7 +25,7 @@ include any transactions at all.
 
 [NOTE]
 ====
-When we say "transactions" in this chapter, we refer to every
+When we((("transactions", "coinbase")))((("coinbase transactions"))) say "transactions" in this chapter, we refer to every
 transaction in a block except for the first transaction.  The first
 transaction in a block is a _coinbase transaction_, described in
 <<coinbase_transactions>>, which allows the miner of the block to