diff --git a/ch07_authorization-authentication.adoc b/ch07_authorization-authentication.adoc
index c657060c..b2717d55 100644
--- a/ch07_authorization-authentication.adoc
+++ b/ch07_authorization-authentication.adoc
@@ -104,7 +104,7 @@ of the time in legacy transactions they contain a digital signature produced by
 wallet from his or her private key, but not all input scripts
 must contain signatures.
 
-Every Bitcoin validating node will validate transactions by executing
+Every Bitcoin((("transactions", "validating")))((("validating", "transactions"))) validating node will validate transactions by executing
 the output and input scripts.  As we saw in
 <<c_transactions>>, each input contains an outpoint that refers to a
 previous transaction output.  The input also contains an input script.  The