diff --git a/book/source/17-zoom_certificates.md b/book/source/17-zoom_certificates.md
index acac0d1..9a6a3cb 100644
--- a/book/source/17-zoom_certificates.md
+++ b/book/source/17-zoom_certificates.md
@@ -339,7 +339,7 @@ As above, the following subpacket data consists of sets of subpacket length, sub
 
 This concludes the unhashed subpacket data.
 
-This next section shows additional components of the Direct Key Signature packet:
+This next section shows the remaining fields of this signature packet, which relate to the cryptographic digital signature:
 
 - `digest_prefix: 0x6747`: the left 16 bits of the signed hash value