diff --git a/ch01_intro.adoc b/ch01_intro.adoc
index fd2833e7..7fb8fa5c 100644
--- a/ch01_intro.adoc
+++ b/ch01_intro.adoc
@@ -195,7 +195,7 @@ hardware signing device.
 ===== Full node versus Lightweight
 Another way to categorize Bitcoin wallets is by their degree of autonomy and how they interact with the Bitcoin network:
 
-Full node:: A full node is a program that validates the
+Full node:: A full node ((("full nodes")))is a program that validates the
 entire history of Bitcoin transactions (every transaction by every user, ever).  Optionally, full nodes can also store previously validated
 transactions and serve data to other Bitcoin programs, either on the
 same computer or over the internet.  A full node uses substantial
@@ -204,7 +204,7 @@ video for each day of Bitcoin transactions--but the full node offers
 complete autonomy to its users.
 
 Lightweight client:: 
-A lightweight client, also known as a simplified-payment-verification (SPV) client,
+A lightweight client,((("lightweight clients")))((("simplified-payment-verification (SPV) clients")))((("SPV (simplified-payment-verification) clients"))) also known as a simplified-payment-verification (SPV) client,
 connects to a full node or other remote server for receiving and sending
 Bitcoin transaction information, but stores the user wallet locally,
 partially validates the transactions it receives, and independently