diff --git a/ch01_intro.adoc b/ch01_intro.adoc
index a501efce..736f545f 100644
--- a/ch01_intro.adoc
+++ b/ch01_intro.adoc
@@ -266,7 +266,7 @@ and installs it on her phone.
 
 When Alice runs her wallet application for the first time, she chooses
 the option to create a new Bitcoin wallet. Because the wallet she has
-chosen is a noncustodial wallet, Alice (and only Alice) will be in
+chosen is a ((("wallets", "noncustodial")))((("noncustodial wallets")))noncustodial wallet, Alice (and only Alice) will be in
 control of her keys. Therefore, she bears responsibility for backing
 them up, since losing the keys means she loses access to her bitcoins. To
 facilitate this, her wallet produces a _recovery code_ that can be used
@@ -275,7 +275,7 @@ to restore her wallet.
 [[recovery_code_intro]]
 ==== Recovery Codes
 
-Most modern noncustodial Bitcoin wallets will provide a _recovery
+Most ((("wallets", "recovery codes", id="wallet-recovery")))((("recovery codes", id="recovery-code")))modern noncustodial Bitcoin wallets will provide a _recovery
 code_ for their user
 to back up.  The recovery code usually consists of numbers, letters, or words
 selected randomly by the software, and is used as the basis for the keys
@@ -355,7 +355,7 @@ applications, the only times they will ask for your recovery code are during
 the initial set up (before you have received any bitcoins) and during
 recovery (after you lost access to your original wallet).  If the application
 asks for your recovery code any other time, consult with an expert to
-ensure you aren't being phished.
+ensure you aren't ((("wallets", "recovery codes", startref="wallet-recovery")))((("recovery codes", startref="recovery-code")))being phished.
 ====
 
 ==== Bitcoin Addresses