diff --git a/ch11_blockchain.adoc b/ch11_blockchain.adoc
index ca61326c..56764fcd 100644
--- a/ch11_blockchain.adoc
+++ b/ch11_blockchain.adoc
@@ -817,7 +817,7 @@ $ bitcoin-cli -regtest getbalance
 
 === Using Test Blockchains for Development
 
-Bitcoin's various
+Bitcoin's ((("blockchain", "test blockchains", "development usage")))((("test blockchains", "development usage")))various
 blockchains (regtest, signet, testnet3, mainnet) offer a range
 of testing environments for bitcoin development. Use the test
 blockchains whether you are developing for Bitcoin Core, or another