diff --git a/ch06_transactions.adoc b/ch06_transactions.adoc
index fc863923..aa6e6872 100644
--- a/ch06_transactions.adoc
+++ b/ch06_transactions.adoc
@@ -797,7 +797,7 @@ transactions out of order:
 
 - If Alice and Bob sign Tx~1~ before they sign Tx~0~, then they're both
   guaranteed to be able to get a refund at any time.  The protocol
-  doesn't require either of them trust the other, making it a _trustless
+  doesn't require either of them trust the other, making ((("trustless protocols")))it a _trustless
   protocol_.
 
 A problem with this construction in the legacy transaction format is