diff --git a/ch11_blockchain.adoc b/ch11_blockchain.adoc
index 68f841d6..ca61326c 100644
--- a/ch11_blockchain.adoc
+++ b/ch11_blockchain.adoc
@@ -752,7 +752,7 @@ regtest blockchain from scratch. You may
 add other nodes to the network, or run it with a single node only to
 test the Bitcoin Core software.
 
-To start Bitcoin Core in regtest mode, you use the +regtest+ flag:
+To start ((("Bitcoin Core", "regtest")))Bitcoin Core in regtest mode, you use the +regtest+ flag:
 
 ----
 $ bitcoind -regtest