diff --git a/ch05_wallets.adoc b/ch05_wallets.adoc
index 519a2a13..91f55b46 100644
--- a/ch05_wallets.adoc
+++ b/ch05_wallets.adoc
@@ -171,7 +171,7 @@ frontends (which don't require private keys) from signing operations
 (which do require private keys).  For example, Alice's frontend
 distributes her public keys to people wanting to pay her.  Later, when
 she wants to spend the received money, she can provide the key tweaks
-she used to a _hardware signing device_ (sometimes confusingly called a
+she used((("hardware signing devices"))) to a _hardware signing device_ (sometimes confusingly called a
 _hardware wallet_) that securely stores her original private key.  The
 hardware signer uses the tweaks to derive the necessary child private
 keys and uses them to sign the transactions, returning the signed