diff --git a/ch05_wallets.adoc b/ch05_wallets.adoc
index df1a769a..7bf5ee6b 100644
--- a/ch05_wallets.adoc
+++ b/ch05_wallets.adoc
@@ -675,7 +675,7 @@ modern standards that may provide additional features or safety.
 [[recovery_code_words]]
 ==== BIP39 Recovery Codes
 
-BIP39 recovery codes are word
+BIP39 ((("wallets", "recovery codes", id="wallet-recovery-bip39")))((("recovery codes", id="recovery-code-bip39")))((("BIP39 recovery codes", id="bip39-recovery")))recovery codes are word
 sequences that represent (encode) a random number used as a seed to
 derive a deterministic wallet. The sequence of words is sufficient to
 re-create the seed and from there re-create all the
@@ -1019,7 +1019,7 @@ However, it is important to note that the use of a passphrase also introduces th
 While passphrases are very useful, they should only be used in
 combination with a carefully planned process for backup and recovery,
 considering the possibility of surviving the owner and allowing his or
-her family to recover the cryptocurrency estate.
+her family to recover the cryptocurrency((("wallets", "recovery codes", startref="wallet-recovery-bip39")))((("recovery codes", startref="recovery-code-bip39")))((("BIP39 recovery codes", startref="bip39-recovery"))) estate.
 
 [[hd_wallet_details]]
 ==== Creating an HD Wallet from the Seed