diff --git a/ch08_signatures.adoc b/ch08_signatures.adoc
index 6dd835d2..41c95a20 100644
--- a/ch08_signatures.adoc
+++ b/ch08_signatures.adoc
@@ -896,7 +896,7 @@ online take you through it step by step: search for "ECDSA explained."
 [[serialization_of_signatures_der]]
 ==== Serialization of ECDSA Signatures (DER)
 
-Let's look at
+Let's ((("serialization", "ECDSA signatures")))look at
 the following DER-encoded signature:
 
 ----