diff --git a/ch08_signatures.adoc b/ch08_signatures.adoc
index ac05481c..3657321a 100644
--- a/ch08_signatures.adoc
+++ b/ch08_signatures.adoc
@@ -680,7 +680,7 @@ MuSig2::
   multisignature protocol that has a BIP as of this writing).
 
 MuSig-DN::
-  DN stands ((("MuSig-DN protocol")))((("repeated session attack")))for Deterministic Nonce, which eliminates as a concern a
+  DN stands ((("MuSig-DN protocol")))((("repeated session attacks")))for Deterministic Nonce, which eliminates as a concern a
   problem known as the _repeated session attack_.  It can't be combined
   with key exchange and it's significantly more complex to implement
   than MuSig or MuSig2.