diff --git a/ch01_intro.adoc b/ch01_intro.adoc
index 880ff5f1..04c18089 100644
--- a/ch01_intro.adoc
+++ b/ch01_intro.adoc
@@ -139,7 +139,7 @@ authority_, represents a breakthrough in distributed computing.
 
 === Getting Started
 
-Bitcoin is a protocol that can be accessed using an
+Bitcoin is((("Bitcoin", "wallets", see="wallets")))((("wallets", "explained"))) a protocol that can be accessed using an
 application that speaks the protocol. A "Bitcoin wallet" is the
 most common user interface to the Bitcoin system, just like a web
 browser is the most common user interface for the HTTP protocol. There