diff --git a/ch01_intro.adoc b/ch01_intro.adoc
index 321344b2..45d290b0 100644
--- a/ch01_intro.adoc
+++ b/ch01_intro.adoc
@@ -30,7 +30,7 @@ hands of each user.
 
 Bitcoin is a distributed, peer-to-peer system. As such, there is no
 central server or point of control. Units of bitcoin
-are created through a process called "mining," which involves repeatedly
+are created through a process((("bitcoin", "mining")))((("mining"))) called "mining," which involves repeatedly
 performing a computational task that references a list of recent Bitcoin
 transactions. Any participant in the Bitcoin network may operate as a
 miner, using their computing devices to help secure