diff --git a/ch03.asciidoc b/ch03.asciidoc
index 6b5e0956..0a5c43fc 100644
--- a/ch03.asciidoc
+++ b/ch03.asciidoc
@@ -11,7 +11,7 @@
 ((("wallets", "best practices for")))((("bitcoin improvement proposals", "Mnemonic Code Words (BIP39)")))((("bitcoin improvement proposals", "Hierarchical Deterministic Wallets (BIP32/BIP44)")))Even though Bitcoin Core includes a reference implementation of a wallet, this is not intended to be used as a production wallet for users or for applications. Application developers are advised to build wallets using modern standards such as BIP39 and BIP32 (see <<mnemonic_code_words>> and <<hd_wallets>>). BIP stands for _Bitcoin Improvement Proposals_.
 ====
 
-<<bitcoin_core_architecture>> shows the architecture of Bitcoin Core.
+<<bitcoin_core_architecture>> shows the architecture of Bitcoin Core.((("Bitcoin Core", "architecture")))
 
 [[bitcoin_core_architecture]]
 .Bitcoin Core Architecture (Source: Eric Lombrozo)