diff --git a/ch11_blockchain.adoc b/ch11_blockchain.adoc
index 322493ed..8e25c2f0 100644
--- a/ch11_blockchain.adoc
+++ b/ch11_blockchain.adoc
@@ -691,7 +691,7 @@ start your own signet and connect your software to it.
 
 ===== The default signet and custom signets
 
-Bitcoin Core supports a default signet, which we believe to be the most
+Bitcoin Core supports((("Bitcoin Core", "signet")))((("default signet")))((("custom signets"))) a default signet, which we believe to be the most
 widely used signet at the time of writing.  It is currently operated by
 two contributors to that project.  If you start Bitcoin Core with the
 +-signet+ parameter and no other signet-related parameters, this is the